We already have the ability to make eye colors that are forced on when you have the appropriate gene or eye implant.
Also there is a def value to restrict face parts to a specific HAR race.
But why isn't there a def value to restrict face parts to specific genes?
Or was this added while I wasn't looking.. =P

I have a handful of ideas for xenotypes with custom eye or mouth parts and would like to make them compatible with Facial Animations.
I've figured out how to make these parts, but not how to restrict them to the genes.