Fine with me. I don't even recall what my original title was. Guessing not an option?
Original title was "bulk edit" and I wanted to make sure the title reflected that you meant editing your collection rather than editing the database itself. That has been brought up recently and some people may get the wrong idea about what the topic was about just by the title.
As far as what you ask for, currently I do not think it can be done. I, too, have a bunch of items in my collection that are not correct. When I first joined the site, I just added games to my collection and didn't check any boxes. It was only a couple years ago I went through the laborious task of fixing up just the hockey, baseball and most of the Sega games in my collection.
I haven't tried to do that in a long time, maybe someone has some tips? Otherwise, thanks for posting in here!