Contact your manufacturer, contact your dealers, contact the reps... If this stuff is important to you (and who amongst us WOULDN'T like to link two different arrangers and have them work as one?
), make some noise. Put it on every piece of communication you ever have with your manufacturer, put it on polls, put it on all the forums...
Rather than make unacceptable compromises (what arranger doesn't have SOME kind of weakness?), linking two arrangers seems a no-brainer, not only for the user, but also for the manufacturers (they'll sell TWO arrangers for every one they do now!
). But it won't happen until everyone gets on board and lets them know...