I really like the idea of being able to drop the weapon before you die, but it would have to be done in a perfect situation where you knew you were most likely to get back to that weapon before the other person. I guaran-fucking-tee you Rafa could show you plenty of examples where this would be useful if he thought about it
i think a really useful option would be to drop the weapon with keeping a copy of it. maybe split the ammo. so you drop 5 rails and keep 5. if you deposit a rail with 5 shots at pillars in dm6 out of control this would be a strategic addition to the game and very interesting.
dropping weapons could allow you to set up traps by using a LG as bait, for example. a longer weapon respawn time would be almost necessary for those tricks to be good at all, i think. like:
1) kill guy
2) deny key weapon at natural spawn
3) drop your copy of it in exposed area
4) top1 mc donolc
well, think five steps ahead: you don't have to be around the dropped weapon to close the trap, but you may have an interest that your opponent THINKS that you're around. maybe he takes another route because of that, which you in turn can intercept etc pp. it's called meta game. :p