This probably won't happen, since the whole point of team damage being enabled is so that making mistakes actually has consequences, but I just get teamkilled too often too not ask for this. Yes, I know, everyone makes mistakes, but putting half a mag into your teammate instead of checking your map real quick to make sure he's not one of yours, is kind of on you. When this happens to me I almost always want to leave the match because I don't want to run around with a shitty weapon and get annihilated and have less fun, just because someone else made an (often infuriatingly obvious) mistake. Don't get me wrong, I'm not perfect, I make mistakes too, and when I do, I don't want someone else to pay for it.
Anyway, just a thought.
Suggestion: Don't lose your weapons in hardcore when teamkilled