"And many things more" not flagged

This would be much more natural as "And many other things" or "And much more".

It would probably be best to find what the more general pattern is before implementing this?

Start by reproducing the unflagged “And many things more” example in Harper and trace the existing checks for similar unnatural “more” phrases. Identify the broader pattern requested in the issue, then verify that the example and related cases are flagged with the suggested natural alternatives.

Written by the indexing model from the issue text.