Sealing Corner Post's

I believe that there should be an option to seal corner posts. There are no real reason in building walls if you cant seal them. (STOP!!) Dont say, "Put a claim up". Some people have massive walls, and that's not always possible. Just makes sense to me.. Even if someone has a claim up, that does not really stop someone that's dedicated. If someone goes through the trouble of building a wall just for some troll to walk buy and wall him in, its sad. Give us the option to seal the corner posts..