As software driven as most modern arrangers are, it is a shame that none of them let you re-map the buttons if a more practical (for you) arrangement occurs to you...
Glad you didn't have to use sys-ex for those variables, Lee!
Back in the RA90 and Sound Canvas days, I used to do a LOT of sys-ex programming. To be honest, I'm glad that most of that is unnecessary nowadays...

The Roland Makeup Tools provides a nice, easy graphical interface to do a LOT of things that used to be absolute bitches to program in sys-ex in the past. Still one of my favorite features...