I think it would be nice to have a slot (or slots) somewhere on the screen you could put a consumable in.
Say for example you have a couple Sylvari Healing Seed Pods in your inventory; as it is now, to use one during combat you have to have your inventory open and double-click it.
If there was an extra slot you could bind to a key and put an item in, it would make for very fluid use of said item.
As it is now we have lots of random items like that sold by vendors, but their use is super limited due to them being stored in our inventory. It would also open up new combat possibilities, at least in PVE.
Thoughts?