I remember seeing that on a different RPG server, you could attack the player in town too (for about 3 minutes).
To add to Kyrie's idea, I would love to see new/updated NPC quests. The current ones aren't worth it, even if you're a level 1 newbie. Increasing the EXP/coins gained would be a start.. or maybe re-vamp them completely so they give out items (weapons, armors), maybe even LCK and SP..
Also, it would be nice if dust was updated. Dust was made for the old EXP system. It costs 24,111 dust to get from level 145-1500 atm.
EDIT: Increasing the ATK of the KLS would be cool, too. It only has 90 ATK right now, so it's really not worth having.