Haha I was thinking the exact same thing just a little while ago! I was trying to make an Arcanine character the other day, and it would have worked perfectly if I could just color the hyena tail marking different from the body tiger markings.
I know I could have just made a preset, but with presets, nobody can see them unless they have downloaded them (that and they're pretty time consuming). And the idea of stacking markings is pretty cool too. It may take a while to see this in-game though (if we see it at all in-game) because it may require some hefty coding on Kov's part.