In a quick defense of trackballs, I am referring to the thumb-based ones, and also I do come up front and admit: it takes about two months to get used to them. However, once I did I am actually almost twice as fast with the trackball than I am with a mouse. It's slightly less than 'twice as fast' for an RTS like SC2, but even more so for FPSs.
As far as personal experience for keyboards, none I've noticed ever did anything particularly handy, excepting maybe
these ones. With those, the little gamepad on the side had most of the important hotkeys pre-mapped for you.
Whether that actually helps anybody out or not is entirely subjective and up to debate.