Well, nice idea and very useful.
But I think I would prefer "the expenditure of POW for narrative control", as Harshax wrote, and as sladethesniper wrote it could be a way to level an adventure/campaign or the players chanses. The only way I would use it in my campaign, would be to have the amusment as ORtrail wrote..."WHEN to use it".
Thx again for the clearification Aknaton.