I would like to have spare ships stored in the citadel. This would benefit solo play and help game play in several ways.
1.) mega robbing: photon/attack ship stored on cit... me in colt, buying equip.
2.) defending my home base: two attack ships in cit... if podded/trans. to other.
3.) ship/trans is protected by planet shields.
4.) gridding: planet grid with weak 1 turn ship... retreat/trans to attack ship
5.) citadel developement: colt stored in cit for products... col'ing ship in use
There are other imaginitive uses to explore.