A) if your gonna make a pvp just simply make it a option like selecting opening a game for the public. Give us a option to make the whole game a true pvp and just add small pvp next to MP lets say. Then those who want pvp can pvp anywhere in game they choose and not just in a tiny area. Also it would infuse the pvp with the regluar game monsters.
B) brawling area, Why not make it a contest ground. Like a event going into Ubers. the whole pt accepts and you begin the battle. Give the battle a time limit say 5- 10 minutes. which ever feels right and the game keeps count of each persons kill count and the winner after 5-10 minutes of battle wins the match and a chance to fight a solo uber at a mp predetermined by the game mp it started on and if that person beats the uber they get a legendary item or some new item you come up with. personally I'd like the Uber for that to be the pissy Angel Imperious. Would be fun to give him a smack down.
Well thats just my 2 cents
thanks for reading