If you go to server.cfg in your StarMade folder the first variable is PROTECT_STARTING_SECTOR.
This is by default off. But when you set this boolean variable to TRUE something magical occurs. Suddently nobody in the spawn area can destroy asteroids with there guns and PVP is disabled in the one sector of 2,2,2. Even with that off people cant shoot and shops and break them or destroy blocks on the shop. I think that there is a way with missiles or explosives that this is possible. Hope I helped.