It would be nice if it was possible to assign an amp or effect as a ‘favourite’ or some other name whereby whenever you use that amp in a preset, then whenever you change the amp it changes all other instances of that amp in every preset. I’m not sure if I’m explaining this very well an example would be to save an amp kith the settings you like it and call it perhaps amp A. You would then assign that Amp ‘A’ to a few presets. If you decide later you prefer a tweak you have made to that amp you are then given the option to automatically apply those changes to all the other amp ‘A’s in all your other presets. It would have the benefit of changing your main amp sound across as many presets as you like across the board without having to do it individually per preset. Perfect for live use when you decide you want to change ‘your sound’ without having to redo all your presets. You could have say 10 different amps and/or effects stored and used this way.
A couple of feature requests already exist for “block sync”, though they don’t have very many votes: