I believe there should be more Crew Skills then the ones currently available in game.
Example,
Mining - Mission and Gathering Crew Skill.
Players could go around the galaxy, mining nodes with a pickaxe they could purchase from the Crew Skill Vendor.
Mining Materials could be used for Crafting Crew Skills Such as... Artifice, Archeology, and Others.
Missions, Companions go due mining missions that bring back materials, schematics, and companion gifts.
This is just a simple crew skill, but I feel there should be more Crew Skills available in game