What's all the fuss about transposing and fill-ins?
Can't you use a pedal or footswitch to apply these?
With my old psr9000 I still had to trigger fills from pedals especially in pianist mode in full flow, where a third hand would have came in handy!
Then you also have a D-beam and Ribbon controller at your disposal. Surely these can assigned as further triggers!
If the VA-7 actually sounds as good as you say it does, (I have played it too) then it seems a bit harsh for you to just abandon it so quickly.
Brian.