Information about items that can be crafted in gun, armour and vehicle boxes would be useful.
Statistics such as gun and ammo damage, recoil and zoom would make and similar for speed etc. for planes would make choosing what to craft a lot easier than having to go into the config files.

Alternatively, hovering over items to show item names/information could be added in the GUIs and then items can generally have stats shown when hovering over the item. This would likely be easier to implement.
e.g.:
[ItemName]
Damage: [value]
Recoil: [value]

I've got part of this working. Need to polish it off and expand it a bit more.