I had some thoughts on that — there is a function called “make_composite_tags” that shuffles around tags for those that are orchestral in a similar way.
Likewise, there was some call to do some other things like that — massage the comment field for various purposes (like doing interesting things with applescript on the client side).
I was trying to decide if it made sense to do some kind of general purpose comment transformation thing, or if I should just special case each common case like the one you are talking about — a “concat artist and title for compilations” or a “split artist and title for compilations”
I’m not opposed to the one you are suggesting, tri.