I'd never thought of using Loop as Shift. Great idea.
Loop + Stop = RTZ+STOP
Loop + REW = Go to Previous Marker
Loop + FFWD = Go to Next Marker
Loop + REC = ARM/Disarm current track
Loop + Play = Solo/Unsolo current track or bus
Not sure if the last two are possible, but would be cool. Forget about navigating tracks with encoder because, a) it isn't any better than keyboard and b) it interferes with NI Komplete Kontrol Software. Modifying the Transport controls works no matter what mode KK software is currently in.
Best Regards,
Dan