Thank you for your answer!

I created a new blog with all answers and hints.

This will help more users and offers th option of a translation.

I hope I addressed all your points. As you will see most of your requested "features" are available already or canb be solved with an adjested fodler structure

I also provided some details about the "search strategy" of mz3Viewer. YOu are completely right: That not only was missing but also had changed throughout the last versions ("learning curve").

If there’s still something not answered or misunderstood, please let me know!