@rockgod78 you might get a ground loop in that scenario (pre/post with an amp's efx loop). I'm doing pre/post with the Mobius in the same way. When you get the H9 try hooking it up the way you're describing and if you do get a ground loop you'll have to add an isolation transformer on the In and...
Aw man, been there hate that.
FYI I almost always remove it my wedging a flathead screwdriver between the pieces of dual lock, rather than trying to rip them apart. Once you get it started it'll usually come off easily.
This portion of what you wrote is doable right now. Just create two actions instead of one. I.e. for button press, create an IA action set Off Value to None. And for button release, create another action and set the On Value to None. Then select the Momentary checkbox (for the release behavior).