Molotov Cocktail would be fun for this game with 2 fun features:
1. If you even touch the fire it sets you on fire, and you then start screaming until you die or find some water to jump into, also if any of your teamates touch you wile you are on fire, you catch fire as well and start screaming, only touching teammates can transfer the fire.
2. If you are still holding a LIT Molotov Cocktail and someone shoots JUST THE BOTTLE before you throw it, it sets the holder on fire and he starts screaming until he dies.
Drawbacks:
1. There will always be some goober that will camp the oposing teams spawn area with Molotov Cocktails setting people on fire as they spawn, and then sitting at home laughing his ass off. These people can be delt with I am sure, such as banning or kicking them from the game.