Probably there are some superclasses not being mechanical. But those probably aren’t things hosts should have influence during the game.
(like game mechanics (day-night cycle/factions (informed/uninformed/multiball)/how executions work (mandatory/majority/plurality. and so on))
I would argue those are modifications among the 6 listed above. (you don’t really can undone info you already gained, can you?)
In my opinion, that’s modification as well. Same reason as above.
That’s definetly rule-changing.