Interactions between crew members, particularly Celise and Anno. Having them reminisce about Victor could expand his character a lot, which would be great if he's going to be more relevant down the line. Also gives a lot of potential for voyeuristic content and threesomes.
More planets tied to the central plot, allowing any additions to the game to be distributed better. What we've got now is already pretty dense and, considering the amount of locations that are supposed to come in the future, I just hope it can remain relatively consistent in size while retaining a decent degree of freshness. Not that brevity is necessarily a bad thing but packing tons of stuff in the beginning and then declining slowly isn't something I'd like much.
A feminine penis-wielder for my crew. Trap, futa or shemale - it doesn't matter. The cum-cow variant of the treatment is a godsend for those that like the treatment, want to pass intelligence checks and be proficient in combat - except my lack of taste for hyper-sized members and masculinity makes taking advantage of dumb4cum a little difficult. Having close access to a source of cum regardless of planet would be great.
Ideally, of the characters currently in, I'd pick (in order) Kaede, Syri and then Saendra. Kaede has already expressed her disinterest in joining though, unfortunately. Cheshire's art has fostered a soft spot for Delilah too, being able to to save him/her for myself would be nice. Though I can appreciate the work of all the authors to some extent, it's pretty evident that I find Savin's to be the most endearing.
Alternatively, allowing us to use our cum from bubble buddies or bionaholes would be a lot more functional.
Tsun Jill.
Can't really think of much else atm.