decals and injuries
Would be cool if injured guys left a trail of blood, or at least walked slower/limped (if applicable- most wounds probably wouldn't cause such a trail). Or affected the guys aim or made him shoot with the other hand. No good reason a guy should be able to run around the map at full speed when sneezing would probably kill him off. Make players know it when they get hurt. As it is, injuring a guy is mostly useless, except for points- if he's alive, he's still just as lethal as before, just a little less armored. Might also bring down the number of draw games if injuries slowly accrued damage (a chest shot eventually kills, regardless of whether it was a PSG or a M9, that sort of thing). And anyway, has anyone actually ever LIVED when getting shot by a PSG (in RL, I mean). Doesn't it do a bit more damage than that?
Anyway, it would be useful if blood stayed around awhile, maybe you'd be better able to tell where your teammates are biting the dust and where NOT to go...
As for shell casings/clips/guns, server should reset that stuff at the end of a round. Guns should stay until the end, 'cause they're still usable objects (same with unspent clips/mags), but used clips and spent ammo cartridges should go on a timer set on the client side. That way, everyone could keep them around as long as they wanted (up to the end of the round, anyway, when the server resets everything), or as long as their system could take it.
Yaweh_