It would be great to have 3 or so "locked" inventory slots.
This would allow users to lock a Regression Ray, endless food item, or other items in place so that they cannot accidentally be moved, deleted, or thrown away.
These items should still be usable, but would not show up in Quick Stock. If you use a one-time-use item, it should still disappear as normal, and free up a locked slot. The lock feature will not protect a book from breaking if read.
Additionally, the slots should show up at the top of your inventory items, so they are always easiest to access.
When you finally decide you want to move a locked item, just unlock it (thereby freeing up that locked space) and move the item as per usual.