As the developer of SkullWalls, this feature is actually included currently. It's the whitelisting feature, you create a custom wall and then you whitelist players to it. Depending on the state of the wall, you should be able to have your desired outcome. Configuring can be a little tough currently, I'm going to work on fixing that.
It sounds like a good idea.... except it would be difficult to pull off because the server woul be trying to find a free place toput the skull, and when there isnt any room left in the region, the server would sorta kill it'sself..
icomputerz I can try and make this.. No guarentee that it will work like planned. I will try soon. icomputerz I believe this is what you are looking for and need. EDIT by Moderator: merged posts, please use the edit button instead of double posting.