Automatically update filter to "Available Offline"

  1. [Wiki] How to globally filter displayed data (Media providers, libraries, only offline media, ...)

It’s 2 clicks to be in offline mode …

  1. The feature is labelled as implemented and already listed in 4.0 beta changelog.

  2. You also can already create a smart playlist that contains offlined files [Wiki] Smart filters

So it’s maybe more a take some time to read the doc and understand how the app works and already fit all your needs.