For some reason !map was allowed for guests, so I disabled it. !frettavote is a command I created that allows the highest ranked user, "Community Leader", to call an internal Fretta gamemode function which starts a gamemode vote. Since I had revised the Fretta gamemode, it calls a map vote instead.
In short, !map is not abusable anymore and !frettavote calls a map vote if used by a Community Leader admin.