What do you mean by that? Solids? Shape layers? What properties? How should effects honor such stuff? I feel that this is one of those "five second flash" ideas that's easy to write up, but that may have much deeper repercussions that need to be considered.
I see. You mean the label color. I was thinking of actual color controls for effects and such. Simple misunderstanding. Not sure if I would want it to be this way, though. The point of coloring individual keyframes for visual distinctiveness would be lost ant the interface very noisy...