Provides the command sm_centerprojectiles [0|1] to shoot rockets from the center (like The Original) for any rocket launcher, shoot pipebombs and sticky bombs from the center, and more!
You'll need to install DHooks2 (included in SM 1.11+) and also all the files from tf2attributes (gamedata/tf2.attributes.txt, scripting/include/tf2attributes.inc, scripting/tf2attributes.sp, plugins/tf2attributes.smx). And of course you'll this plugin...
and also the steamworks extension https://github.com/KyleSanderson/SteamWorks/releases -- https://users.alliedmods.net/~kyles/builds/SteamWorks/