No, what I was referring to was a system put in place to lock people to classes once inside the dungeon. To prevent people from steam-rolling content.
Scenario without class lock: Everyone goes in as battle classes, changing at certain points for crafting/gathering.
Scenario with class lock: Four battle classes, two gatherers & two crafters are required to enter, once inside classes are "locked" so as to prevent changing and steamrolling.
Like I said this is by no means a perfect idea and would need to be fleshed out, but the principle I think remains interesting.