This is a pretty sweet idea for a contest. Section 8's trying to be the new Tribes, and Tribes had some awesome voice recordings. SHAZBOT! Here are my entries, tuned to maximum cheeziness because that's how Tribes was and tailored for when you stomp on somebody's head because that sounds fun :p...
They're not charging for a mod, they're charging for a game. If every game on the Source engine was a mod, Zeno Clash, Dark Messiah of Might and Magic, SiN Episodes, The Ship, Postal 3, Vampire: The Masquerade - Bloodlines, and other games would all be mods.
I hope they add Carpathian Crosses. All 3 popular RO mods are really fun, but CC takes the cake in my opinion because of the mortar and the awesome maps. Oh, and the Soviet Naval Infantry. Those guys are crazy.
If you had ever seen guns fired in real life, you would know that generally it's almost impossible to see a muzzle flash, and certainly it never flashes anywhere near as much as guns in games/movies do.