Well, personally i would really like to have this option, based on the fact, that i want to gain xp as well, and not lose them due to someone diconnecting.
After all it all comes down to this now, win and gain xp. Most people who play @xp just play to win and gain xp imo. Thats pretty obvious, because people just started to add when they knew it gives xp.
Even if we didnt have xp, xp was about having higher quality games, wasnt it.
Is 4vs5 higher quality? No, so why would you want to continue this game?
The xp factor is just another reason to remake/readd these games
So think it would be justified to bend the rules a slight bit for the rather small xp community.
PS: My team and me just won a 4vs5, you never know
