What if you could use an immediate action to perform a free action? Tell me how it would break the game! How creative can you get with doing one minor thing out of turn each round? Like ceasing concentration on a spell, dropping an item, dropping to the floor, or shifting your grip to threaten with your gauntlet instead of your polearm (or vice-versa). I proposed it as a house rule for a game that I'm in; but then I remembered about unintended consequences, so now I want to make sure that it isn't a bad idea.
If this sounds familiar, it's because my first question was fatally flawed. A non-response could mean anything from "I have no interest" to "I never tried it" to "I tried it and it was fine" to "I know exactly how I'd exploit it, but you didn't ask that". So I'm asking that. ;)