Would it be possible to add co-op categories? We would have a NG+ All Chapters Co-op run to submit.

Did you play on unlimited mode or classic mode? NG+ All Chapters Co-op would mean you could play on either, but unlimited would be faster. Classic would need its own category though, like NG+ All Chapters Classic Co-op.

The run was done in classic mode.

OK, the category is listed as Co-op Classic NG+ All Chapters.