Guys, please let's remember: "to cut a long story short trying to do so crashes MIDI Designer" doesn't really help us find and fix the bugs. Anything that consistently crashes MIDI Designer is an awesome, replicatable bug and WE NEED TO KNOW ABOUT IT, otherwise we cannot fix it and get you working again.
Channel changer supers are limited to 127, not to 16.
Both of you are kindly invited to get in touch via the in-app mail and get on the Alpha/Beta test team. It's a separate App that gets installed, so you can test as little or as much as you want without affecting your production MIDI Designer (and it's cool to get an Alpha and Beta to play with, too).
Right now the only values you can inject are channel changers (L)... We've been talking about injecting more values (X, Y, Z, etc.) but it's not a feature yet.
Thanks so much for the enthusiasm and great dialog.
Best!
Dan