Is it possible to disallow certain races and classes?

Hi I'm really looking forward to the release of KotC 2 hopefully in the near future but I was wondering something about the included editor toolset and couldn't find an answer in the FAQ section. If you wanted to create a module set in a different world with different lore, like Forgotten Realms or maybe even Medieval Europe, would it be possible to prevent players from picking certain classes, races or spells? Furthermore, would it be possible to prevent players from doing that and then allowing it later? I'm mostly interested in the first question but I would appreciate an answer for the second as well, thanks.