Is it possible to set other id3 tags like bpm, grouping etc?

[tombburnell]

There are many other possible id3 tags than the ones available to set in the options. https://id3.org/id3v2.3.0#Declared_ID3v2_frames

Is there way to set these with this library?

[jankarres]

All ID3 tags are supported for which LAME currently offers explicit parameters according to their manpage.

If you need a support for additional ID3 tags, I would be happy to see a PR from you so that all users can benefit from this enhancement!