[Chantillary_of_Kerisdale]

I think you might've gotten confused.

Without the Heroes mod installed, the turn won't start.

With it installed, but not turned on, the turn will start and turn the mod on without asking permission.

I think, if people are going to be creating pretenders without this mod being active, the best thing to do is to (short term) rename the appropriate .dm file with another (additional) extension (like .backup) so the game does not recognize it as being valid for its use.