That all looks far too complicated to me,
Farael.
My speculation about vampires was as an alternative to werewolves, rather than as an additional team. Even then, it would need to be carefully worked out and might ultimately prove to be unworkable.
All this adding extra roles and boosting the powers of others to compensate seems to me simply to add unnecssary complication and risks seriously unbalancing the game. I am all for tweaking the roles or trying out new ones, but I think it best that these things be done incrementally rather than by wholesale change. That way, new roles can be tested with minimum risk of imbalance and, if they work, can be later incorprated into new games in different combinations.
Oh, and I still don't like wereorcs. They just come across as wholly underwhelming.
How about were-wyrms? They're canon.