Two points to consider The 50 crew limit was base coded back in the days of transistor development.
When they tried to up it, crews were lost hand over fist, so given up as a bad idea.
HQ has a function for moving entire crews, it is called Deposit Ship. When you take them out, all crew come out pre loaded.
BUT
You need enough HQ space to store the ships on top of crew
Premium ships can not be stored in HQ (something I would like)
$DE want you to buy Olives, hence I think this useful feature of the HQ is left as the only good feature because you need to buy HQ expansions.
Another good feature would be to sort crews in HQ by nation or level. But as they can not even get the navigation buttons at the top of he screen in these forums, I do not hold out much hope. Reformatted on PC