I really like how the "Donate" screen works where it shows you all the things you could possibly donate and you just pick from them. I wish there were more things like this.
The biggest example would be "Eat." When I'm pooped or about to croak, it's a real pain going through ALL my bags to a) find out IF I have any food b) figure out WHICH food I want to eat. An "Eat" button with a dialogue similar to "Donate" that shows all edible items would be very helpful.
Second, I'd love to see some sort of automatic categorization abilities. It's very time consuming to sort items between bunches of bags. I'd love to be able to set a tools bag where anything that "makes" things would automatically be directed there. Similarly, a bag for anything that came from mining/harvesting/squeezing/nibbling/etc. Basically, functionality to set rules for bags the same way I'd filter my inbox.