I'm sure if we can come up with some good reasons, Allan will consider adding one in. I've been thinking for a while that TM could have a pallet API, for things like a color picker, color swatches (a few blocks of color that paste in as hex), HTML entities.
So, the ultimate question is can users (other than HTML/CSS designers) gain from a color pallet as a hard-coded feature? If it's something that a large % of users could use, then I'm sure we've got half a chance of convincing Allan :)
I'll sent him a few ideas in the next coupla days...
Justin