If Lee has set it so that you can have a light source at the weapon - like when you fire a machine gun, maybe you can put a yellow light on the gun and activate it so it illuminates the surroundings when firing - nice effect and certainly not something Lee won't have seen before. Anyhoo, if it has that feature then it should be fairly straightforward to make a torch object, and set a light onto it - you'd just make the firing time rediculously long or something to keep the light enabled.
Not that I'm suggesting you actually put a torch in a game, don't want to encourage people to copy ideas from Doom3, I'd rather wait and see HL2 give them better ideas
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Van-B
It's c**p being the only coder in the village.