A much needed change on the PvP server is being able to get PvP credit for DOT deaths once a person zones.
Also, I believe necro lifetaps should be healing for full effect. I base this on when the PvP damage nerf was implemented they only say spell damage was reduced, nothing about the healing from the lifetap.
http://www.tski.co.jp/baldio/patch/19990913.html
"In order to make PVP combat between spellcasters and melee types more viable some changes to PVP spell effects have been made. All damage spells cast in PVP combat will do less damage to the PC than the same spell would do to an NPC."
Another much needed change is pets shouldn't agro mobs, at least on the PvP server. People constantly just run by mobs if they have a pet on them and 99% of the time, they agro the pet thus training the owner; plus Bards High Sunning a pet can cause a massive train on the pets owner and friends and it a gross OP advantage in PvP.
I think this change should be on both servers just because pathing isn't all that great anyway as well as pets falling through the world and such.