I absolutely love this idea and was planning to try the same (narrative control by expending inspiration) when I eventually get to run a game. I've run some Fate and Story Engine system games where this idea of communal storytelling is key to developing and directing the story, and I've had a...
Stumbled on this from Google while looking for this very answer. Has there been any word on how this works? I could go for a loss of PP if a psionic takes a theme encounter power, but losing the at will as well would be painful.