There are two Bynars in the game currently but they are ultra rare.
You can get Suliban others ways than the doff pack now?
You can also get Sulibans through the assignments found on people's cell ships and Bynars are not that rare if you open lockbox support packs. I've cracked open a few hundred of them and they seemed to have a similar distribution as Hunter, Vorta or Jem'Hadar from the Gamma packs.
Overall, I'd like to see additions to some of the existing major species. Add a few Cardassians, Romulans, Caitians, Ferasan, Bajorans etc... with varying traits and abilities, so that it's viable to build crews from a single or select species.
It's always bothered me that my Klingons had to have Humans or a Jem'Hadar aboard to get access to certain traits, that all my Romulan scientists have 2-3 negative traits for certain science assignments or that there is only a single Caitian with resolve.
Well, you get the same Suliban from the Cell ship assignment that you get from the doff packs. this is why the civilian assignment doesn't give doffs and the rest do. There currently are no Suliban Civilian Doffs.
As for trait pools.... it's really the main thing(aside from aesthetics) that makes the races differ. that and it kinda doesn't make sense for certain races. For example, Aggressive simply doesn't make sense on a Deltan. I've actually spent a lot of time studying the trait pools of the various races after LoR. Suliban have a rather limited pool in general. 2 preset traits, and 2 chosen at random from 4 possibilities. It's better than Vorta. Exploration cluster Vorta have one set, Dathan has his own set. The rest of them have the same exact set. Having 1 doff with telekinetic and peaceful is cool, but there are only 3 that DON'T.
And yes, I agree that Romulans stink at artifact recovery.
There's more than two Bynars, and they're not all ultra rares. The one I have isn't even very rare. They were fairly rare within the one doff pack that had them, but they were still just standard doffs.
As a BOff, it would be nice to have Fed Bridge Officer as big as a Gorn...
Andorian would be a nice KDF ultra rare DOff. They were considered worthy adversaries by the Empire prior to joining the Federation. Maybe one who wants to get back in touch with his militaristic history. (I have two alien KDF officers who have traits identical to Andorians. So... I made them Andorians.)