LWC had piston-destruction issues fixed on Aug 17th https://github.com/Hidendra/LWC/issues/51. Pistons don't destroy protected blocks, signs, doors, etc. Not anymore. I suggest a new rank: Engineer. An engineer can place both types of pistons. This will have a twofold effect. First, there will be a list of all the people who can place pistons. If a piston-related greifing problem arises, it won't take long to resolve and identify the guilty party. Second, it will create a new rank, attainable through donation or eco-cash, to raise funds for the server. A rank is only worth having if there's something to get. Pistons add a whole new depth to MC. I'd buy "Engineer" before "Pilot", but that's just me. I prefer the building part of MC to the fighting or exploring parts. Obviously, this would involve either spawning slimes or selling slime balls. I'd recommend both, but that's just me.