1. Yes you can mismatch them i.e you can assign them to any station regardless of their qualifications. But note this that they won't give a high amount of work efficiency(green bar) if they are assigned to different stations other than their qualification. And two they will get tired faster in mismatched stations. So always try to assign your crew based on their qualifications. That is the only sensible thing to do in real life and in game.
2. Yes we(I) always use Helmsman in the control room. The reason see no.1
3. Your station can never become too efficient(more than 100%). The green bar will have limits. As a few numbers will give high efficiency that is a possibility if you assign the correct crews.
Good hunting.
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