I tried to find any toppics about this. Without any luck.. So here is my idea. Somewhere back in my memory i know the mane was sugestid. But again, i could not find it..

We have the light/medium/dark(countershade/solid) system with bases. I'd like that! What if we could have the same thing for mane/eye colours?

I'd know it would take lots of time. But I am willing to wait. It would work the same like the bases, but the countershade/solid could be left out(just to make it more simpel).

Personally I find it quite hard to understand all the genetics, with the new system the bases make sense. But the manes and eyes, is still difecult.