The ability to randomize whether a character even has a robotic limb. As it stands the feature only allows a guaranteed robotic limb (with randomization on which kinds), or no robotic limbs at all. The ability to have a chance for any individual limb to be organic as well would be great, as there are not many cases where I'd want literally every NPC of that type to have them.
For example, adding economy limbs to western hiver characters. The hive is well known to make limbs, and yet none of them actually use them. It'd be great to add them randomly into the characters, so that you can sometimes come across ones with a limb or two.
Ideally it would be separate for each limb. So you could for instance have a 50% chance for an organic right arm and 50% chance for an economy right arm, while also separately having a 75% chance for economy left arm and 25% chance for KLR left arm. The way I'd suggest doing it is to make use of a negative value on quality, similar to how clothing works with a negative value on quantity to act as an empty slot.
But really any method would be appreciated.