I've an idea. A list of who's using where and when for RP. This way other players are aware of groups and RP'ers residing in specific areas. Not as a way to 'claim' a piece of land, merely a way to announce your use of it so you're aware of who you might run into, or even what schedules they have there, allowing you to try to avoid them if you're a bit more territorial.
Is there something like this already?
If not, it'd be great if someone decided to pick the idea up.