I'd really like to see some kind of fire grenade which acts like a normal grenade but causes a fire which keeps burning for a while, maybe spreading. I have only seen this in one single FPS before, and that's my old multiplay favourite Strife (using the Doom engine /infopop/emoticons/icon_smile.gif). It'd be really useful, especially for blocking of passageways, and I can't imagine it could be hard to code - if the Doom engine can do it, surely the UT engine can.
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