I have noticed that the inventory screen can get really cluttered and hard to manage. I have a bunch of high level items that I'm holding onto for later but make it hard to sort through the stuff I can use. You should have a chest at your keep that you can store items that you like or are to high in level to use. Also when you go to a shop you can have a little chest icon you can click on so you can access your items with out running back to the keep. I think that will vastly improve inventory management.
I agree, it would be even nicer if we could just make separate lists within our inventory for our own organizing purposes.