Filter (and label) folders
I would really like to have the option of organizing my filters in folders. That way I would create dedicated filters for private, work, etc without the list becoming crowded.
It could also be a nice feature for labels. The folder doesn't have to show up when applying a label (typing @), it's just for making the label list easier to read (and organize).
Filter folders would be the thing that I would benefit the most from, I have more filters than labels and my filters are dedicated to a role, such as work or private.
Keep up the good work guys (+1)