That one is about some capability to tests build or stuff, without having to endure the cost of it.
it could also help playerx to provide more guide on the wiki.
currently there not that much way to simulate things.
So i came with the idea to have a map server (or a full environment for that, don't know the best implementation) dedicated for that, with a few harmless commands provided (@item, @refine etc)
to avoid some player to play on it, it could be wiped at regular time.