Even though I almost always manage to get top scoreboard and k/d on duel server, I find that this ranking system would break the fun. At least half of the players there come
to either train or try out a new build or outfit. If we include ranking there, we won't see those people again.
Don't change duel server, other than for the fixing of overhead delay and lag on strat battles. If you want a ranking system, as Zerran sugessted, let people have the choice of it.