So...
How realistic is it to keep intensely radioactive fuel rods in a personal locker?
Wouldn't you rather have that multi-tonnage of ammo somewhere near the gun that is using it?
Don't think of it as a physical locker in your cabin or whatever, think of it as a partition on your hard drive. It's all part of the same space (your cargo hold), it's just that you've designated the part called "personal stores" or "ship's supplies" or whatever as immune to transactions. You are a merchant selling your loot, and you're just differentiating your inventory and your personal property.
DISCLAIMER: the rest of this post doesn't take into account any of the last four posts, as it was written before that.
More keystrokes = bad
All other things being equal, perhaps. However, flexibility plays a role as well:
Currently, to get to any specific item, there are many keypresses (or a sustained keypress as you wait for the list to scroll, which counts as many keypresses). You have to scroll all the way to the bottom if you want IDs or misc items, while armors and weapons are near the top.
Completely removing both identification items and all medals from the game and replacing them with some kind of virtual item like rank is NO keypresses ever. However, you can never interact with them as items, including selling them or finding them (finding a black market ID is very possible, and medals are worth quite a bit).
Adding a category system with a category for IDs, medals and similar plot items is ONE KEYPRESS to single out any itme type you want (which will by nature exclude IDs and medals unless IDs and medals is the category you picked.
I think the added flexibility is worth one click - the system also lets you sort any type of item you'd like - when you're dropping ores into the fabricator you can just solo out the ore category, one click and the only thing that shows up in your view is ores. If you'd like to drop fuel in as well, then you can click on the fuel tab - now you can see ores AND fuel. Done with that , okay, disable both ore and fuel tabs and it defaults back to all (as no categories are selected).