A while back the development changed it so that people who attaked someone could not just run into their house and house hide. Now one of the new issues is boat hiding. On the Atlantic shard their are several boats along the shore (north/west) that people are using to do exactlly that. So I would suggest comming up with a solution to this problem, although it is not an easy task. I would suggest though that if this issue cannot be resolved that you allow people to use their houses to create fairness.