Locking items into inventory
Senator Tom
You should be able to lock your various weapons/materials into your inventory so that you dont merch them on accident. This could speed up the merching process by a lot. You would lock the things you want to keep, then hit something like 'Sell All' then everything but the locked things could be sold the same time.
Witchblade
bags are yer friends 
Teh Diablo
That's why they make the little toggle option. Like when your on the Sell Merchant screen it will have little thing you can check. So you can view with bag, belt pouch, backpack, and blah blah.
mega_jamie
its annoying when it toggles for ALL your slots tho