I use (or maybe overuse) the "Rescan / Add Files and Playlists" feature quite a bit. I end up scrolling a lot with my large collection of folders (artists). It might be my system, but I am unable to use my mouse scroll wheel to scroll up and down in the pop-up window titled "Choose Folder". I need to use the slider along the right side.
My suggestion - make all pop-up windows scrollable with the mouse wheel.
Thanks - keep up the great work!