THEY do that now. It would be no different than we have now. They use out of game tools to communicate. Having in game tools will not change this. And it is a pvp issue not a guild issue. You fix it buy using pvp tools. Not by banning guild tools. If they do the pvp gawking in civilized areas maybe make them not welcome in civilized stations. How fast would you change your behavior if you had a hard time finding places to repair?