I tossed it around on the moddb comments section but figured it may get some more interest if maybe I tried suggesting stuff here instead.
"Just pitching thoughts, but I was thinking about the way the dwarven faction works as when you start the game, you select a different sub-faction, and that could possibly be used for the remaining two after Imladris/Gobbos are finished in the main mod.
As for the brand new factions? Men of the east, with Harad and Rhun being the main sub-factions to select with khandish being a large buildplot option,
the other two maybe being anduin vale/rhovanion maybe.
As I said, just thought of it, and I have no idea if that would definitely work, and the anduin vale/rhovanion is mostly wishful thinking since I just finished a LOTR TW play with both respectively, though a beorning/woodsman faction would be a bit interesting if mostly ad-hoc with characters like Angmar is, likely the same with rhovanion."
Please share your thoughts, I don't know if this type of thing has been suggested.
I'm mostly one to like the idea since if used for 'Evil men' or 'Men of the east' it could still support sub factions, and additionally leaves a slot for a whole new faction too.