Wel s2 also has another purpose now, we use it more frequently than we did before.
It's also pretty easy to get a sniper only match going there whenever you and your friends want to have one. Maybe you can even ask an admin to lock the server for you guys.
If you guys can vote to change the map and gametype on server 3, maybe you can get a sniper only match going there too. In that case, it would be nice to have vote kick on as well, so you guys could kick rule breakers. You just can't get a mod to come in and enforce a rule that isn't part of the server rules.