Filling things in is super annoying. Also, this could solve a few griefing issues. If people can have access to the //set command, then filling things in would be a solo job, that takes seconds. Set the limit to ≤500 blocks at a time for //set. Maybe configure it so you can make it so some people can use W/E on your plot and others cannot. I feel as if this could be used for making walls in large structures.