I believe two people would be preferred as the scanner works as a directional turret. You have the pilot moving the ship while a buddy scans. If you were alone you may have to stop or if you find something in space quickly get out of the scanner seat and run back to the pilot seat.
The terrapin now does not have the greatest weapons and it’s very slow moving. The shields have a lot of hit points but very slow to recharge. It does not maneuver well. So with all that I do not believe it will be a tactical scanner.
I can’t really answer the third question cause I don’t know much about the other two ships.
I don’t know what the multirole will be unless they add maybe a repair option in space since it’s tough it can take hits, repair a ship and get out.