So with the sector increasing in size, much more focus on long ranged travel, commodities needed for salvage/surveying and just much heavier focus on auxiliary fleet tasks I feel its high time to introduce more ways to spec your ships for these tasks.
A pair of suggested solutions:
Cargo and Fuel ship mods (either learned through skills or modspecs) that increases respective capacities depending on hull size
A system similar to how you put extra vents or capacitors on ships
Other than Surveying mod there isn't many industry or trading related customization in the game and it helps put me off auxiliary game play