A few interface thoughts that culminate in something:
I would really like a toggle in the codex to view a ship's turrets and arcs. I would also like to zoom in and out of the pictures in the codex. There is no place to click to take you to a ship's codex entry from the refit screen, or something to mouse over that gives you the codex details in a convenient pocket-sized popup. Thumbnail ship images in the codex listings would be a nice option (like a file manager viewing as a list or icons).
What if you merged the codex into the refit screen? They're both lists of ships on the left, with an image of the selected ship and performance numbers (sector map- or combat-related, below or above). I'd like to be able to see all the details about one ship on one screen, and it's silly that I have to use the mission interface refit screen to get a look at the turret arcs/mount type location of ships I don't own in the campaign.
Other codex interface thoughts:
Given the profusion of modded everything: seeing the codex get a search string, or adding blueprint-style categories (high-tech, {REDACTED}, midline, etc) would also be nice.
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With upcoming changes to {REDACTED} salvage, could ships that are otherwise hidden in the codex when you start get entries after you own them, pokedex-style, if only to save me the trouble of popping back to the fleet screen to click the codex link from the ship itself?
While we're talking about Interface Flow:
The current flow at Stations is a mess. How to buy a new ship? Click on Trade... and, uh, figure out you're supposed to hit the Fleet button. Things like that should get addressed; I honestly think the Station Dialog will need a revamp at some point before 1.0, to make it easier to understand / navigate.
Speaking of stations: I would love hotkeys to cycle left/right between open, military and black markets. A and S aren't doing anything in the inventory or fleet screens right now, so you could use them for it.