Currently (to my knowledge), there is no way to change a trigger type. For instance if I have a keyboard shortcut that I would like to change to a midi shortcut, there is no way to do it other than to rebuild it in the separate group. The copy paste function doesn't work between trigger types either--it seems to paste in the original group from which it was created.
It would be nice to be able to change trigger type for any action series block i.e. keyboard shortcut to midi trigger.