I know this is sort of late in the game, but I'd really love to see some black keys in the set. While EVA 01 is heavily purple and green, the other biggest portion of the mech's body is black.
I do not have specific kit modifications to suggest at this very moment but I wanted to get my thoughts down before it slips my mind and I'm kicking myself in a few months. I'll play around with some stuff and come back with an idea.
Edit: Actually, I think inverting some (if not all) of the orange keys would take care of this quite nicely.