If you are Romulan (Reman doesn't count) or high in Diplomacy(Marauding you can recruit an NPC on the Romulan mining colony in Mine Enemy as a pretty good rare medical doff.
Find an NPC called Rai close to the beam in point and talk to her.
Her special power is extra healing for copper based blood lifeforms.
Yep. She's already a valued member of my crew.