What I'd like to see is a little more fighting in the streets.
I just had this idea. What if every zone could work as an arena. Supposing you have 2 people who are willing to duel each other. What if, instead of running to the arena or a PvP zone, you could send a sort of 'PvP-tell' to each other.
'You have been invited to a duel. Do you want to duel, Dirtybob?'
If you answer yes to that the duel is on. Inside Omni-1, Tir, Newland, wherever. As long as both are in agreement. Also if you're in a team, the whole team gets involved. PvP zones should of course still work as they do.
Another thing. If someone attacks a guard of any faction. Like Omnis going to Tir attacking the guards, they should become possible to attack by players around them. Like it is now it's just the most silly war I've ever seen.