This small app allows the permanent alphabetical sorting of playlists in Spotify. This is useful for iPhones etc. and why this is NOT base functionality, I would never know. The source is under the sample apps directory in the mac framework.
Download from: https://github.com/williamschey/cocoalibspotify/releases/download/1.0/SpotSort.dmg
This app makes use of the SSKeychain which is available here: https://github.com/soffes/sskeychain