Firstly, I have an admin on my server who starts being abusive. The only solution would be to kick/ban him. "Sorry you cannot kick/ban admins" is the horrific result. Host should be able to kick/ban anyone.
Secondly, the fact that anyone can walk into your server, save your bricks, load it on their server and claim it as theirs is not one that appeals to me. There should be an option to turn on/off client saving, or only admins should have the ability to save.