Extrinsic Qualities?

[HuibertDeVries]

In gUFO no Extrinsic Quality is defined.

With Extrinsic Qualities, I mean measurable aspects that depend on multiple Endurants, like 'Lenght Difference', 'Distance' between two mobile objects or 'Position' relative to an object.
Analogous to the difference between Relator and Extrinsic Mode,
one could distinguish between symetric Extrinsic Qualities (that equally depend on both related individuals, like Length Difference and Distance)
and asymetric ones (that inhere in one individual and are externally dependent on another individual, like Position).

Is it a conscious choice not to include Extrinsic Qualities (for example because it is not logical to disinguish this type) or was it just outside the current scope of gUFO?