In the meantime, we can always make "Romulan" missions that are officially designated for Starfleet or KDF (as I have done), and will only be visible to Romulans allied with the chosen faction. Just be sure to make clear in the mission description that it's really meant for Romulans and not whichever allied faction you designate.
Re: Neverwinter Foundry features
The one I want most is campaign support; i.e. the ability to chain missions together into multi-part campaigns.
Re: BOffs as captain's mouthpiece
That, too, is fraught with some peril, as you have no way of knowing who a player's BOffs are either. You touched on this in relation to KDF BOffs, but on the Fed side, Vulcans don't talk the same way most other Fed races do. (Otherwise, you could get away with writing for pretty much all other Fed races as though they were human.) As for the Romulan Republic, Remans also have their own style of speech - they tend to be a bit less wordy and more to-the-point than Romulans.
I'm sure she'll be an intriguing character for years to come, at least as long as she doesn't go all Miley on us.