The following entities have had Max Passengers bumped up from 12 to 13:
- PB-950 Patrol Boat
- Empress-class Super Freighter
- Class 720 Freighter
- Herald-class Shuttle
- 578-R Space Transport
- QH-1 Imperial barge
- EVS Construction Droid
- Senate Shuttlebus
- Personnel Skiff Model IV
This allows you to now take a full squad with you. Enjoy!
EDIT: I forgot to actually apply the change to existing ships, but it should show 13 passengers now. Sorry!