diff --git a/device_api.md b/device_api.md
deleted file mode 100644
index e69de29bb..000000000
diff --git a/icicle_v3/CMakeLists.txt b/icicle_v3/CMakeLists.txt
index 89d23255e..0460230a5 100644
--- a/icicle_v3/CMakeLists.txt
+++ b/icicle_v3/CMakeLists.txt
@@ -17,6 +17,20 @@ endif()
 # Print the selected build type
 message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
 
+# Find the ccache program
+find_program(CCACHE_PROGRAM ccache)
+# If ccache is found, use it as the compiler launcher
+if(CCACHE_PROGRAM)
+    message(STATUS "ccache found: ${CCACHE_PROGRAM}")
+    
+    # Use ccache for C and C++ compilers
+    set(CMAKE_C_COMPILER_LAUNCHER ${CCACHE_PROGRAM})
+    set(CMAKE_CXX_COMPILER_LAUNCHER ${CCACHE_PROGRAM})
+    set(CMAKE_CUDA_COMPILER_LAUNCHER ${CCACHE_PROGRAM})
+else()
+    message(STATUS "ccache not found")
+endif()
+
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
 # Build options
diff --git a/wrappers/rust_v3/icicle-core/Cargo.toml b/wrappers/rust_v3/icicle-core/Cargo.toml
index 48c869ccf..12fc197d9 100644
--- a/wrappers/rust_v3/icicle-core/Cargo.toml
+++ b/wrappers/rust_v3/icicle-core/Cargo.toml
@@ -19,5 +19,4 @@ serial_test = "3.0.0"
 once_cell = "1.10.0"
 
 [features]
-no_g2 = []
-no_ecntt = []
+
diff --git a/wrappers/rust_v3/icicle-core/build.rs b/wrappers/rust_v3/icicle-core/build.rs
index 240dee0b4..5f977a6b5 100644
--- a/wrappers/rust_v3/icicle-core/build.rs
+++ b/wrappers/rust_v3/icicle-core/build.rs
@@ -11,13 +11,6 @@ fn main() {
     // Construct the path to the deps directory
     let deps_dir = build_dir.join("deps");
 
-    println!("cargo:rustc-link-arg=-Wl,-rpath,{}/icicle/lib", deps_dir.display()); // Add RPATH linker arguments
-
-    // default backends dir
-    if cfg!(feature = "cuda_backend") || cfg!(feature = "pull_cuda_backend") {
-        println!(
-            "cargo:rustc-env=ICICLE_BACKEND_INSTALL_DIR={}/icicle/lib/backend",
-            deps_dir.display()
-        );
-    }
+    // Add RPATH linker arguments
+    println!("cargo:rustc-link-arg=-Wl,-rpath,{}/icicle/lib", deps_dir.display());
 }
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bls12-377/Cargo.toml b/wrappers/rust_v3/icicle-curves/icicle-bls12-377/Cargo.toml
index 6f410540f..ab21c6e42 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bls12-377/Cargo.toml
+++ b/wrappers/rust_v3/icicle-curves/icicle-bls12-377/Cargo.toml
@@ -21,9 +21,10 @@ cmake = "0.1.50"
 
 [features]
 default = []
+no_g2 = []
+no_ecntt = []
 bw6-761 = []
-no_g2 = ["icicle-core/no_g2"]
-no_ecntt = ["icicle-core/no_ecntt"]
+no_bw6_g2 = []
 cuda_backend = ["icicle-runtime/cuda_backend"]
 pull_cuda_backend = ["icicle-runtime/pull_cuda_backend"]
 
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bls12-377/build.rs b/wrappers/rust_v3/icicle-curves/icicle-bls12-377/build.rs
index 8403b29e6..dffea23ad 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bls12-377/build.rs
+++ b/wrappers/rust_v3/icicle-curves/icicle-bls12-377/build.rs
@@ -26,7 +26,6 @@ fn main() {
     config
         .define("CURVE", "bls12_377")
         .define("FIELD", "bls12_377")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     // build (or pull and build) cuda backend if feature enabled.
@@ -59,7 +58,6 @@ fn main() {
         config_bw
             .define("CURVE", "bw6_761")
             .define("FIELD", "bw6_761")
-            .define("CMAKE_BUILD_TYPE", "Release")
             .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
         // build (or pull and build) cuda backend if feature enabled.
@@ -71,12 +69,12 @@ fn main() {
         }
 
         // Optional Features that are default ON (so that default matches any backend)
-        if cfg!(feature = "no_g2") {
+        if cfg!(feature = "no_bw6_g2") {
             config_bw.define("G2", "OFF");
         }
-        if cfg!(feature = "no_ecntt") {
-            config_bw.define("ECNTT", "OFF");
-        }
+        // if cfg!(feature = "no_ecntt") {
+        config_bw.define("ECNTT", "OFF");
+        // }
 
         // Build
         let _ = config_bw
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bls12-381/Cargo.toml b/wrappers/rust_v3/icicle-curves/icicle-bls12-381/Cargo.toml
index 33fa839d3..68446911f 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bls12-381/Cargo.toml
+++ b/wrappers/rust_v3/icicle-curves/icicle-bls12-381/Cargo.toml
@@ -21,8 +21,8 @@ cmake = "0.1.50"
 
 [features]
 default = []
-no_g2 = ["icicle-core/no_g2"]
-no_ecntt = ["icicle-core/no_ecntt"]
+no_g2 = []
+no_ecntt = []
 cuda_backend = ["icicle-runtime/cuda_backend"]
 pull_cuda_backend = ["icicle-runtime/pull_cuda_backend"]
 
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bls12-381/build.rs b/wrappers/rust_v3/icicle-curves/icicle-bls12-381/build.rs
index 50403f4c0..91ba603e5 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bls12-381/build.rs
+++ b/wrappers/rust_v3/icicle-curves/icicle-bls12-381/build.rs
@@ -26,7 +26,6 @@ fn main() {
     config
         .define("CURVE", "bls12_381")
         .define("FIELD", "bls12_381")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     // build (or pull and build) cuda backend if feature enabled.
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bn254/Cargo.toml b/wrappers/rust_v3/icicle-curves/icicle-bn254/Cargo.toml
index be6529fe6..538385447 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bn254/Cargo.toml
+++ b/wrappers/rust_v3/icicle-curves/icicle-bn254/Cargo.toml
@@ -21,8 +21,8 @@ cmake = "0.1.50"
 
 [features]
 default = []
-no_g2 = ["icicle-core/no_g2"]
-no_ecntt = ["icicle-core/no_ecntt"]
+no_g2 = []
+no_ecntt = []
 cuda_backend = ["icicle-runtime/cuda_backend"]
 pull_cuda_backend = ["icicle-runtime/pull_cuda_backend"]
 
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bn254/build.rs b/wrappers/rust_v3/icicle-curves/icicle-bn254/build.rs
index b2542ba8d..4830ad1ef 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bn254/build.rs
+++ b/wrappers/rust_v3/icicle-curves/icicle-bn254/build.rs
@@ -25,7 +25,6 @@ fn main() {
     };
     config
         .define("CURVE", "bn254")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     // build (or pull and build) cuda backend if feature enabled.
diff --git a/wrappers/rust_v3/icicle-curves/icicle-bw6-761/Cargo.toml b/wrappers/rust_v3/icicle-curves/icicle-bw6-761/Cargo.toml
index e13159098..0ac8de931 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-bw6-761/Cargo.toml
+++ b/wrappers/rust_v3/icicle-curves/icicle-bw6-761/Cargo.toml
@@ -21,8 +21,7 @@ cmake = "0.1.50"
 
 [features]
 default = []
-no_g2 = ["icicle-bls12-377/no_g2"]
-no_ecntt = ["icicle-bls12-377/no_ecntt"]
+no_g2 = ["icicle-bls12-377/no_bw6_g2"]
 cuda_backend = ["icicle-bls12-377/cuda_backend"]
 pull_cuda_backend = ["icicle-bls12-377/pull_cuda_backend"]
 
diff --git a/wrappers/rust_v3/icicle-curves/icicle-grumpkin/Cargo.toml b/wrappers/rust_v3/icicle-curves/icicle-grumpkin/Cargo.toml
index d69018cef..c797f76ac 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-grumpkin/Cargo.toml
+++ b/wrappers/rust_v3/icicle-curves/icicle-grumpkin/Cargo.toml
@@ -8,7 +8,7 @@ homepage.workspace = true
 repository.workspace = true
 
 [dependencies]
-icicle-core = { workspace = true, features=["no_ecntt","no_g2"] }
+icicle-core = { workspace = true }
 icicle-runtime = { workspace = true }
 # criterion = "0.3"
 
diff --git a/wrappers/rust_v3/icicle-curves/icicle-grumpkin/build.rs b/wrappers/rust_v3/icicle-curves/icicle-grumpkin/build.rs
index e4fd78cc6..8af4e5230 100644
--- a/wrappers/rust_v3/icicle-curves/icicle-grumpkin/build.rs
+++ b/wrappers/rust_v3/icicle-curves/icicle-grumpkin/build.rs
@@ -25,7 +25,6 @@ fn main() {
     };
     config
         .define("CURVE", "grumpkin")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     // build (or pull and build) cuda backend if feature enabled.
diff --git a/wrappers/rust_v3/icicle-fields/icicle-babybear/build.rs b/wrappers/rust_v3/icicle-fields/icicle-babybear/build.rs
index 16aba61c4..f9c78e430 100644
--- a/wrappers/rust_v3/icicle-fields/icicle-babybear/build.rs
+++ b/wrappers/rust_v3/icicle-fields/icicle-babybear/build.rs
@@ -25,7 +25,6 @@ fn main() {
     };
     config
         .define("FIELD", "babybear")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     // build (or pull and build) cuda backend if feature enabled.
diff --git a/wrappers/rust_v3/icicle-fields/icicle-stark252/build.rs b/wrappers/rust_v3/icicle-fields/icicle-stark252/build.rs
index aa8b0bff5..017c5a006 100644
--- a/wrappers/rust_v3/icicle-fields/icicle-stark252/build.rs
+++ b/wrappers/rust_v3/icicle-fields/icicle-stark252/build.rs
@@ -25,7 +25,6 @@ fn main() {
     };
     config
         .define("FIELD", "stark252")
-        .define("CMAKE_BUILD_TYPE", "Release")
         .define("CMAKE_INSTALL_PREFIX", &icicle_install_dir);
 
     #[cfg(feature = "cuda_backend")]