I guess an easy way for it to be done would be to tie it to the kill/death ratio. Yeah I see no way to do it with custom arenas.
The thing is it would be great for everyone, the aces out there.. and there are allot of them... will be flying for the most part against each other, going for the top tier, all the not so great fliers (me) would be match our fighter skills , mostly, against those that are in our own skill range. Seems like a great way to hone your skills.