I'll just throw in a quick suggestion: Make it so that the team who wins the round with the less casualties makes the most gold. I think this would be the best way to ensure teamplay and tactical play.
I don't understand your sentence. You mean the less casualties on the winning team, the more bonus they get? Because the winning team will always have less casualties than the losing team, which has 100% casualties.
As for the multiplier loss, I don't get how you people have no time to take a piss or get a drink. I can understand if you're Miley and are always the last one alive, after mowing through 10 dudes. But for the rest of us who die sometime during the middle of the round, there's always time to do what you need to do. I've had maybe five times ever where I've had to leave the game because of something. Losing it because you didn't spawn into a new map in time does suck but, eh, its not that big of a deal.
About the multi changes, I really hope there is something for assists. When you're an average player like myself, it sucks when you kill three horses and take several people down to their last bit of life, yet never get the killing blow. Also, noobs would never be able to get ahead of the game if they didn't get something.