Having an action which checks the currently selected inventory item would be a really useful addition.
It could be used in an "equip" menu in which you put certain items in certain equipment slots, it could help with specifying unhandled hotspot interactions for each inventory item, and I'm sure there are plenty of other uses for it that others can think of.
Seems like a relatively simple script too, though I wouldn't really know where to begin without a bit of help.
Comments
GameObject.FindWithTag (Tags.persistentEngine).GetComponent <RuntimeInventory>().selectedItem;