I don't know about other people, but I organize my cards primarily by color. Would this be terribly troublesome to add?

Well I have avoided doing this as I wasn't sure how to implement it best (it's debateable how the order should be when taking into account the multi colored and hybrid cards).

But as I already received a couple of requests for it, I've added it to the TODO list.

Wizards uses wubrg, with hybrids before multicolored, I think...

All right... popular demand brings you color sorting! Enjoy :)