Ideally the mod tools should be available to everyone, and the servers should have the ability to exclude players that don't have a "Repka mod pack" or, possibly, a slightly different "ATAG mod pack" (to address and respect any small differences that the respective Server Admins have decided what FM mods best fits the needs of their respective community).
So offline, a player CAN have a "Mach 2 Hurricane" -- with 8 cannons if he so wishes -- yet to fly on an online server only a server-approved/designated mod pack can be used. I don't know if the files.sfs folder can be pre-screened by a server at this point.
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