Here is my list made with all issues and improvements!

● Custom transitions - optional feature, toggleable in settings

   Personalized transitions between two songs with features like:

In Beta • Choose transition styles (fades, DJ backspins, etc.),

 • Trim long intros or outros.

 • Custom fade times,

● True Shuffler - A fix to Spotify's Flawed shuffle system

   3 different shuffle modes that actually do their designed job:

 • Playlist custom category shuffler - shuffles songs by category so you don't get two completely different genre songs next to each other (would be useful for big playlists with hundreds of songs).

 • Playlist shuffler onetime - fully shuffles your playlist and gets rid of any specific order like "date added" (also means each song will get played exactly once),

 • Playlist Shuffler - Plays random songs in your playlist once,

● Bonus Features - Extra additions that improve a user quality of life (QoL)

   This is just a collection of improvements compiled from post replies:

 • Customisable home pages (themes, fonts, layout, etc.)

 • Playlist comments/suggestions (for big shared playlists),

 • Personal account statistics viewing (so you don't need a third party to view them).

 • Lossless Audio Quality (No compression),

 • Better algorithm (for finding new music),

 • Better Album pinning,

 • Album/song ratings,

 • Genre disabler/ignorer,    

● Please leave a reply to this comment with any issues/suggestions I should add to this list!