Great idea! But if I understand your request correctly, we already have a system in place for this. It's currently applied to the Addams Family (regular/gold), modern Stern games (pro/prem/LE) and some of the remakes. The system is very simple: one game is set as "parent" of a group and then others are added as "children".
For example, Ghostbusters Pro (PinsideID #2378) is currently a parent of the Ghostbusters group. And the Premium/LE (PinsideID #2396) is set as a child. This is displayed as:
ghostbusters_versions (resized).png
I'm sure there's plenty of older games in our archive that have not yet been "grouped" like this, due to lack of time and/or knowledge on my end.
Is this what you are asking? I could set you up as an archive editor and allow you to edit these things in our archive.
Another cool idea would be something like: "if you like this game, also check out that game". But I don't think that's what you're asking, right?