Probably going to need an assistant engineer/coxswain, largely because when ships do bad things to themselves, the chief engineer is the first to die from acute radiation sickness.

~That or get sent to a regen-tank in sickbay for a whole chapter.

BTW, you're going to need a doctor/EV-specialist.

The 'swain also assists in piloting the ship when things are pretty much either needing absolute-trust in the engines capabilities as of that particular moment (like landing), or when things are super-dull and the pilot wants to do some recreation rather than going perception-blind looking at a screen-saver.