Welcome to the forum, abdo5720315
Despite I appreciate your efforts to improve the Edain Mod, your post is lacking the proper requirements to be valuable. Precisely:
1. Polls are not permitted until there are two or more detailed, explained and well consolidated ideas, and users reading them may vote for their favorite one
2. You haven't explained why you would like to implement these features, nor you have motivated your opinions
As for a general answer, those changes are very unlikely, atleast the second and the third ones, because:
2. The Edain Team has stated that they won't add Trolls of the North to Angmar either because they wouldn't fit the faction and would make Angmar overpowered. As for why Angmar doesn't have a subfaction, it's because Angmar didn't have any external allies during its lifespan, so it would be unfitting giving it a subfaction (furthermore, who would you deem fitting for Angmar?)
3. Angmar has a very large hero roster, therefore adding Agaundaur wouldn't be necessary, and also repetitive, because his role would overlap those of other already existing heroes