I would love to be able to crew more than 10 BOs. Here are some thoughts for consideration:
1. Game balance would not be issue as the main skill cap would still be in place and players are still limited by ship assignments and away teams.
2. The BO skill points would become a sinkhole for all those BO skill points I seem to have in abundance.
3. The ability to create missions specifically for certain BOs could lead to more content.
4. Sinkhole for outfits and gear for additional BOs
5. If and when the interiors get made it would be great to see my additional BO (crew) at their posts or just filling the interior of the ship.
Just some thoughts, heck I'd even be willing to purchase more BO slots from the C-Store (revenue could be a good reason to implement).