I know this is far out there and tangential, but has anyone thought of using something along these lines as a replacement system for combat itself? That is, instead of tactical grid-based action-by-action combat a system based on a party's general tactics and the DM adjudicating DCs based on how viable their powers and strategy seem in comparison to those of the enemies? I like D&D combat as its own mini-game, but it often feels like fun:timespent ratio is far far lower than that for skill challenges I've run, and I would like plot to move faster. Just curious since I've enjoyed Obsidian skill challenges.