First, it completely BUTCHERS this "vanilla server" concept.
Second, That is a single player client side mod, so it CANNOT be installed server side.
And even if it could, you would need the client side version or you couldn't connect to the server.
And to top it all off, the "even if you could" assumes a complete rewrite of the client code, and the server side code would have to be written, and we don't have (correct me if I'm wrong) a coder willing to make a mod like that, And even if we did have the mod written, the mod would need to be installed client side in order to connect. We would lose more than two thirds of our players.
My unleashing legendary wrath upon idiots quota for today is: (print_var 'idiotquota')
Are you referring to that nonsensical catchphrase John made when the server was first created? C'mon man. A "vanilla" version of a game is a game as the creators made it: without any modifications by outside parties. If there is a modification to the game...it's not unmodified. These are black and white adjectives. It's either is vanilla, or it isn't.