For Lockdown deserters (rage-quitters), I'd like to suggest a two-hour ban from playing Lockdown. It's not too long to give grave trouble to anyone, but it also encourages people to stay on with the match.

Someone might say that it's not their fault if their connection or computer hangs or there's an urgent family matter at hand. But it surely isn't the rest of the team's fault either, who are actually losing the match because of you. And if there's a constant problem of you hanging, then you shouldn't even be playing, but addressing the problem, instead.

But because I know this will in turn also increase AFK'ers (which are effectively even worse, because they take the spoils of the game, too), I think those rules should also be improved. I've seen some people just randomly walking against walls over half of the game, but still get points. Haven't reported them, because they might be just lagging. But either way, I think the rank points and money given should also be distributed based on the input you give for the team.

This shouldn't be based only on damage, though. I think OOO should add some algorithms to determine how much one benefits the team in total. Examples: guardian's health regeneration, recon's defense debuffing, captures and defends (or alternatively the amount of time increasing the domination point's influence), and naturally the general damage. If someone is greatly differing from the team's average, he will get more or less points and money (for example min 70%, max 130%), but still get the same tokens. If he's clearly an AFK'er (all zeroed or erratic/non-existent movement), he will also lose the tokens.

Maybe even disable the bribe prizes for recurring rage-quitters, altogether. (Apparently some people do this type of "hunting")
This could be determined by the ratio of rage-quits and finished matches. 70-80% of finished matches would be good in my opinion.

edit, extra comment for reasoning:
Lockdown is a virtual war setting. Deserters are highly despised in war. If I'm not completely mistaken, deserters are traditionally also quite heavily punished, to discourage the act of deserting.