I'm so glad I'm not the only one. Coming up with departments and duty assignments wasn't all that difficult. The hardest thing I found was naming the human crewmembers, so that there were a diverse number from various countries (I've got people of Korean, German, Icelandic, Swedish, French, Czech, Russian, Japanese, Spanish, Chinese, Italian, South African, Maori, and a couple other origins) just so they're not all Anglo-origin names.
i have to agree the specialist positions are fairly easy to come up with and if you go to certain resources it makes it a no brainer. There are also name generators which I use for more background characters. The most difficult part I found was the rank system. On Nightingale this is the rank system I use...
Captain Commander Lieutenant Commander Lieutenant Lieutenant (JG) Ensign Warrant Officers
Master Chief Warrant Officer Senior Chief Warrant Officer Chief Warrant Officer Warrant Officer Enlisted Personnel
Master Chief Petty Officer Senior Chief Petty Officer Chief Petty Officer Petty Officer First Class Petty Officer Second Class Petty Officer Third Class Crewman First Class Crewman Second Class Crewman Third Class
Getting the right number of each rank is incrediable tough. At first I had more MCPO than I did CSC, which was wrong, so it took an hour or so to sort it out to have the right balance of ranks.
As for species I actually got a list of every species known (or thought of due to evidence). I've got 51 members out of the 150 so far (plus I've made one up).