Here's a small suggestion. How about we make laying down the official sign for surrender in duels/combat? It might also be good to have some kind of language in the rules that nullifies any attack rights a person might have had once they surrender. So no surrendering to stall your inevitable defeat only to re-engage after a brief bit of RP.
"If you're still alive to gripe about how horrible you've got it, then you haven't got it too bad."