As I saw on a lot of mmorpg there are "battlegrounds";10vs10 pvp two team avaible from levels after lvl 10/15.the team will win for who does more kills,you can get medusa point or in future (pvp points to get pvp gear).I would like a lot to see it too in Dbo it would be funny.I think this suggestion is not hard to do because maybe you only have to create a field for battle,and some rules for it,by the way I think it's a good suggestion.Maybe players could receive exp too from some daily pvp quest or simply joining the battleground.
Thank you for reading,waiting an answer from a moderator or something like this.