any particular reason you are adverse to a 'fill cargo bay with this resource' button?
My main thought is that you dont intend for players to be able to print money quite as effectively,particularly from mining bases and factories (i can make ~30% profit on my entire bank account on a mining -> factory run, and another ~25% on hightech -> sy.. sy->mining is pretty low in comparison). The mechanics just arent there yet. How deep do you plan on going with it? Will stations store these resources and actually build their outputs with them over time?
are resources intended to be sunk somewhere other than trading, with some minor sy interactions? (is there a sy interaction self help menu somewhere?) and abandoned stations?
can I carry around a factoryship that produces random things out of resources? (I know you mentioned planning around owning a station somewhere that did something like that, so maybe thats it?)
Im just kinda randomly spitballing here, I am sure you have some plans, and I would certainly be interested in hearing them, but dont spill all of your secrets