So I was just thinking of things I think would be kind of neat. Honestly I'm not expecting it to happen, it's just an idea I had =P
I was thinking of being able to put bounties on peoples heads. Similar to the donation system, you could pick someone on the enemy team and assign some of your own cash to him.
Then, if someone on your team kills them within a certain amount of time, that teammate gets the money and a fraction of the money offered is added to the team's score.
However, if nobody kills him within the time limit, the money goes to him instead.