In a way similar to the Audio Mixer editmode but without nullifying the extent code (editmode bypasses all the mixers' influences once allowed), it would be nice if anything Playmaker centric such values, states, events, links, etc. could be force-saved even at runtime instead of being totally reset.
Now, as always, I must ask if such a function already exists and if for some reason I managed to entirely miss it. It would be a biiiiig plus if it did exist.
Now, as far as the UI goes, perhaps a button to "save changes in FSM" somewhere in the Graph view (and also in the FSM components in the Inspector) would be a good start?
These changes being stacked in the CTRL/Command-Z "Editing History" would be good too.