At the moment, we have a pretty well rounded group.

We have..

Captain
Medic
Weapons specialist (development and maintenance)
Two kickass's with charm 
A few soilders ( one with hacking skills)
Navigator
Tango "AI" seems to take care of warnings and such
Engineer and Robotics specialist 


The good thing is that Jones has allowed Co-role positions as long as you speak with the original role person.

I don't know if Jones Captain character would take over flight/piloting but that could be something so it isn't just an "AI" doing so. I'm sure there are other open positions I haven't thought of that could work