Aditional tags support (comment, lyrics...)

Would it be possible to add option to add/edit for example (comment, lyrics, date, publisher,…) mp3 tags to Edit track information modal window of AudioPlayer?

The main function of Audio Player is to play audio files, …

Cover search and tag editing are nice to have, but the main development goes in a different direction.
That means: No, we’re not planning to enhance the tag editor at this time. Please feel free to file a feature request on GitHub.