This would make Gadget far more useable in a live situation, as well as make it easier to try out different song structure ideas.
The current way of changing via on-screen touch is fine as long as you are working entirely in Gadget. I am using Gadget alongside iElectribe and a Beatstep to control iMS-20 so I am not always concentrating on what Gadget is doing to be able to keep switching to the app to trigger scenes.
Of course, if you added iElectribe and iMS-20 as gadgets I wouldn't have this problem......until I then want to use Beatstep to control iSem or iMini
Which I would, we are never happy us musicians