I tried to look for an option to enable autoscrolling via middle mouse button, but since I couldn't find it I would like to suggest this basic feature. Please correct me if I'm to blind to find it.
For me personally it's inconvenient to scroll with the mousewheel or use the scroll bar on the right side of a windows to scroll through long playlists/albums and would love to be able to do it with the middle mouse click like in most web browsers (Firefox for example). It would be optimal if it worked on every panel (Artists, Albums, Playlists, Next tracks etc.) and I wouldn't mind if it is an Opt-In setting, since I don't assume that autoscrolling is everyones preference.