There is a bunch of games to play it all depends on the genre you prefer. Some of my favorites include Portal / Subnautica / The Beginners Guide / Star Citizens. I suggest checking out what YouTubers have played and try those games out :D
This is one of the perks that buying a rank gives. This is not rank abuse so do not state it as so. If you want to change the appearance of your stick you can do so with a texture pack.
Let players do what they want you will run into players like this in real games, and this is a training server after all. Let them train to build their walls.