There are some seemingly simple things that I constantly wish I was able to do with my FC that would significantly improve on their usability, but can't. Some of my ideas:
The ability to actually schedule a jump for a later time instead of starting it the second I choose where I want it to go. For example, if I want my carrier to delay a jump for an hour while I wait for people to board because I won't be present by the time they get there. Doing this could just add more time to the jump timer, which I know is/can be done.
The ability to set a specific amount of a commodity to sell instead of just having to sell the entire stock. I mean, we already can do this when buying commodities, why can't we when selling them?
I wish I could see how much I bought a commodity for (and each amount if I bought it at different prices). I tend to purchase large amounts of ore, and one time my buy orders were completed and I couldn't remember what I bought them for so I had no idea how much I needed to sell them for to make a profit. I know it's my fault for not keeping track of what I bought it for, but I don't think I should have to, especially since that information is already stored somewhere (evidence is when you go to sell those commodities, it calculates the profit/loss, so the information is somewhere). This would be useful in many other ways and situations.
And of course, transferring tritium from the cargo hold to the tank.
I know some things that seem trivial are not, but most of these should be. Especially since for some of these, something very similar is already done, or a part of it is already there. These are just some thoughts of mine that I thought I might as well post about.
Source: https://www.reddit.com/r/EliteDangerous/comments/v44h3t/some_qol_ideas_for_fleet_carriers/