Even if this were possible, I would not want this as a standalone app.
Unless this used the torque 3d engine updates would have to be separate (even in a different language), not to mention being compatible with other versions.
Also, good luck with apple letting you mod the game.
Also, as it would be stupid to have the game mixed as it would be much easier with a mouse, they would be segregated, splitting up the community even more.
Good luck with finding a game, playing on your own sounds fun.
The only thing I would see it as, at most, is a gimmick, and an annoying one at that.
(Also, how would you jet/move/shoot/throw grenade/use core in quick succession, or at the same time?)
I only see one advantage. Zooming in with the "pinch" thing. That it.
[/indepth and unnecessary rant]