It looks like TRL natively supports a game controller on the PC, judging by this post from last February.
"How's this play on PC?" http://www.gamefaqs.com/boards/920216-tomb-raider-legend/53293142
citronvand posted on 2/2/2010 at 11:13 AM "I suggest you get it for the PC and use a gamepad, 360 Gamepad works great for this, Anniversary and Underworld, you don't have to config it at all, just select gamepad in options and it works like a charm."
"But if you do get it for the PC you must have a good gamepad, I'm sure other gamepads work great if you don't want to give $$$ to satansoft but usually the console gamepads (360, PS3) are superior (they can be used on a PC with proper equipment)."
Jove the Sleep Depraved. Primal Wiki: http://primal.wikia.com