unfortunately there are priorities that needs to be accomplished in time, particularly for a very small company like Eventide. I do not have a possible release date for the H7600 at the moment. I'll try to support your need!
Believe me, bugs can happen in any area and I'd prefer to live w/a minor importance one like this (you can always use MIDI program Changes) than with audio ones.
I don't have a 7600 here. My H8000FW SRC doesn't switch back to off on power cycle.
My test had a CD player in play mode, connected to S/Pdif 1/2 while power cycling the H8000. The 2 units may be different though, regarding I/O management.