Ok one idea, is if you dont want people building in a certain location, instead of putting a brick there and taking away trust, make a no-go-zone type thing, in the selected area, a person can not build.
2. Non-destructo bricks, for minigames, sometimes if you want to use the sniper rifle, bricks to keep people into the arena can sometimes be destroyed. so make a gun where you can shoot a brick and it would get destroyed when someone shoots it.
and 3. make something that can scan for bricks way out where you cant see them, that way you can keep track of spammers and delete bricks.
Just was thinking of cool stuff i would use.