I second this!
Something along the lines of being able to pre-designate an item to a slot without having to deposit an item in the storage box itself.
I would see it working something like:
Select a slot or multiple slots
Bring up a radial menu similar to the build menu (radial would only display items which have been discovered already)
Select the desired item
Selected slots now display a faint image of the desired item
Quick deposit would then prioritise these reserved slots over empty slots and will not deposit any other type of item within the reserved slots
Whilst on the topic of OCD inventory management, having the defrag option on storage would be a nice quick win in the interim.