We tried this last weekend and it was very interesting - like what you have done so far!
One thing I noted as GM, running a combat with about a dozen NPCs, was that having it constantly pop up was an issue. For a lot of the mooks I didn't need it. I don't know if I'm missing something, but it would be nice to be able to choose by token whether or not it pops up, or maybe a pop up list of all tokens and then choose (mostly for a GM to use, of course).
Also, wondering about integration to call up the existing modifier box available through GGA, which is excellent?
Also, perhaps some "favourites" where deeper menu items could be player selected to appear up front on a favourites list for fast access?