Revamp the interface to where the health bar/MP bar/exp bar is placed horizontally in the bottom center of the screen. In the middle of the exp bar display the penalty exp when given. The buffs can stay where they are.
Ability to create macros for in-game commands.
Pillars!...this game needs beam pillars.
p/join and p/lead should have notifications so that we aren't trying to figure out if we're in the party or not.
Guild bonuses could be based on the number of geosids taken over, maxing out at 16%(16 geosids when the community expands).
Revamp the way chat is placed, or maybe up the chat box on top of your character.