Returning to the A and B functionality in H90, that would be really valuable if you could test your recent modifications to a program against the saved one.
Sometimes this program is in the middle of the bank, so if you wanted to save it, that would take a lot of scrolling. And then if you wanted to A and B them, you would probably also need to take the original one and save that one as well, so they are next to one another. Much hassle.
A simple solution if facilitated by the device: just as you long press programs button to save, you could perhaps long press parameters button to A and B between the saved program and the product of your tweaks.
That would be a simple and neat way to tell if you need to save or just keep tweaking.