Feature: Option to use every image exactly once and varying sizes

[carhartt21]

Hi,
first of all thanks for sharing the software.
It mostly lets me do exactly what I need when I want to create a quick collage.
There are just two aspects that I'm missing:
First of all, it would be great if I could choose to use every photo from the loaded library exactly once.
Currently, I always have to play with the sliders for the amount and size.
Unfortunately, in the end, I still often have duplicates or don't know if images are missing.
Second, I would like to have the option to use varying sizes in the square mode where the images are not stacked other each other. This option already exists in the default mode.

Best regards