sources > discogs > redirect custom tags

Simple enough right. Why not have these tags go into their appropriate fields?

For the default discogs source the only thing that is out of context is Country & Date.

This is because default should work proficiently I don't want to spend time configuring with other methods (Pone Mode) that not an average user will understand.

MP3 file tagging is not an precise standard, the "standard" tags are only a loosely defined collection.

View -> Extended Tags (Alt+ T) and "Customize Columns" allows you to 'map' the metadata to the fields and values you prefer.