I don't enter the technical details you mention but usually put in as many contributing artists as possible, such as soloists in jazz or opera, orchestra, choir etc. I have a lot of classical songs with piano accompaniment and have added a custom tab "accompanist".
I am quite keen to get the genre right and sometimes have difficulty entering this accurately because many classical discs contain tracks of several genres. It is quite possible for a chamber music disc to contain, for example, a piano trio, a string quintet and a violin sonata. You can only enter the genre for the whole disc not separate tracks.