One idea

[Misunderstood]

Actually an offline mapeditor(one not built into the game) is much more secure. If its built into the game, its easy for someone to send their client the correct packets to open the editor and see the details of a map(sometimes it would give them an advantage, like finding out where a hidden key might be)

Of course making a random packet name would help, but if they know a mapper....they could still find that.