This is 4 separate suggestions, and really should have been 4 threads.
Usually, when I do this, people respond to one, and no-one notices the other ones as a result.
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1: - Custom weapons. Would be interesting, but would requires serious code rewrite I suspect. Also would add a lot more complexity, and skew things further in the player's favor. Disapprove
2: - Missiles/Torpedos as like Fighters. Interesting idea. I certainly far prefer regenerating missiles (Which continue until CR decays sufficiently that they stop regenerating). Not sure what you mean by Deliver systems, and how Warheads are different. Do you mean that you buy a consumable resource that creates the torpedos/Missiles, and blueprints are like fighter blueprints that convert said resources into missiles in battle? Interesting approach, at least, not sure if Approve, need clarification.
3: Mousewheel for sales quantity - This, and also a text box for quantity, and other QOL stuff, because getting exact numbers is a pain in the .... Approve
4: More officers per ship - Disapprove. First of all, those stances are AI stances, not stat modifiers. Secondly, stacking those skills wouldn't really work. Thirdly, you can't really get more than, like 8 or 10 officers currently, and that is PLENTY. Fourthly, you want each ship to have an officer, doubling up just makes it worse. Disapprove
So, Disapprove, Need more info, Approve, Disapprove.