Got to agree with you, Dennis, on that one... Roland have introduced several new, unasked for capabilities to new OS's for their arrangers, but at the same time ignored user pleas for more basic operational fixes. Makes you aware that probably, the marketing division has more influence with the R&D guys than the users..

I guess, especially for G70 users, the worst thing is that there appeared to be SUCH a desire on Roland's part to get what was initially such a poorly thought out OS (it's a great design, but some of the details were half-brained, for sure!), and two major OS revisions later, much of what was wrong has been eradicated. But there are a couple of clunkers out there still unfixed, and some of the new additions have operational aspects that could be made better, but the main thrust of each OS update has been the release of new features, which, in Guitar Mode's case especially, are of little use (and great design complexity) and must have monopolized much of the R&D team's attention.

Fix the basics first, add new capabilities later.... That's how at least I would prioritize things

So, anyway, amidst all the new features you get in OS2 for the PA2Xpro, I hope that Korg pay attention to the long-unfixed fills issue. Who knows, maybe they can finally get around to offering as many fills as their competition as well, rather than the paltry three (or two and a break/fill usually) that they currently support...
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An arranger is just a tool. What matters is what you build with it..!