Heroes 5 – by Azmadon (Izmail).

New Hero Class Framework (new hero class IDs)

Am I understanding correctly? New class IDs simply allow you to add new classes, such as Knight/Dungeon Lord, and then specify their "Available schools with chances," and configure the requirements for perks available to them in the "skills" section.
However, I don't quite understand how the "native faction" for these classes will be determined. Or am I simply forgetting about the existence and location of such a setting?
Another question: how does this work with hero selection at the start and in the Tavern, including for old maps where these heroes theoretically didn't exist yet.
-- -- --
*) Additionally, a question about "sets" of artifacts (including for these new classes) and the ability to customize them, although I don't rule out that I'm simply forgetting where this is located.