Here's an idea for you: a world event where players can attack the usually not-attackable NPCs.

If you've ever betrayed FP with a dark elf, you'll know the woman in Willow Wood I'm thinking of here. I can't remember exactly what she says, but the gist of it is something along the lines of "Who let the skank in?" every time you walk near her.

And then there's that infuriating bloke who endlessly yells "You! Come over here!" in Crossroads.

I'd lay out hard plat to kick the bejeesus out of either of them, and now that I've mentioned it, you'll spot NPCs all over the place who deserve a sound beating and they'll bug the hell out of you too.

Doncha think it's about time they let us let rip on these guys?