I would highly recommend that player to player trading be unrestricted and that the regulations on the auction house be loosened a bit. Player to player trading is really just essential in a MMO more so in a MMORPG such as WoW and ToS. With the auction house I would recommend that the limit for non-premium players be 10 or at the very least 5, with premium going to 15/20 and 10 respectively with the non-premium stuff.
Anyone else feel free to comment below, this is the suggestion forum after all. Its good to see everyones view on this topic.