The Arrow filter item frame thing is nice, but i'd like to be able to just right-click on a cabinet and pick, from a list, which folder i want. not use an item frame, and not have to pull them out one at a time.

I second this for some better manual interaction. Even something like if you put a filter in an item frame and rotate it, it displays the icon of the contents of the folder, so if you have logs and sticks in a cabinet and rotate the filter in a frame, it would display logs when it is set to the log folder and sticks when set to the stick folder, etc.

More manual interaction requests:
-Different interactions like shift click pulls 1 item out and click pulls a stack?
-Add to the Magnifying Glass GUI a slot above or below each folder showing it's contents you could click to pull a stack out of and a slot on the side you could drop items into to put them in the cabinet?
-Ability to put the arrow filter frame somewhere else besides above, like directly on the side of a cabinet.