I don't think something like this would really be possible unless it was formatted in a very particular way made specifically to interact with the way things are listed on VGCollect... which varies depends on who submits it. For example, the proper format for listing different editions is something like "Champions of Norrath - Greatest Hits", but then you get stuff like
this that doesn't do it exactly the same, so that would probably mess it up when you try to add something. Same with limited editions and such. You could possibly use catalog number, like SLUS-XXXXX, but two different versions of a game can share the same number.
I'm not an admin, but I think you'll have to add them one-by-one.