For the love of god the iphone needs controller housing with some analog sticks and shoulder buttons. I'm sorry, but there's only such a limit you can get with touching the screen and tilting the sucker (which is horrible for looking at a screen, but I digress). Single-player ports of Q1 and Q2 could work, but you'll never get to play the games in full control/twitch glory. If you're going to make a "Quake" game, make something original with a new moniker, because it's just not the same thing unless you can rocket jump properly.