Not sure how technically feasible it would be given your current system but I'll run this idea past you guys anyway. I've been studying "Remembering the Simplified Hanzi 1" (Heisig, Richardson) and a big part of learning the characters using their method is to remember a very specific keyword associated with that character. Now this keyword may only capture one meaning or aspect the character may have (and sometimes, though rarely it seems to not have much relation at all). However this keyword is really essential to their learning method. Would it be possible to allow users to attach their own definitions to words or characters that get displayed below the standard Skritter definitions?
I understand this may not be a trivial task but it may be worthwhile to take a poll or something to see how many people would find such a feature useful for their own studies.