If you aren't in the PvP-free zone, it's open season. Only rule is that the player must be online. Also, none of this "waiting for csi to come online" BS. If you have the ability to take it back by force, then do so. In addition, I'm working on a list of weapons and explosives that will be considered regular PvP and therefore allowed at any time.
Also, I currently stand undefeated. I take all challengers (every second weekend, when I'm on a computer that can actually run Voltz).
And last but not least: I reserve the right to randomly help assaults if I see them in progress, switch sides when I get bored, and leave in the middle of a firefight.