The title pretty much says it all. The G4GG GeekLists (and other contests) are probably the most striking example. I want to see what games are added to the list, not get a new notification every time something passes a bonus threshold or whatever.
I've had to unsubscribe to certain GeekLists that I'd otherwise like to keep tabs on, simply because the edits kept springing up in my subscription list. It's not a huge issue, but an annoyance that I'd be grateful to see resolved.
When you say new items, but not edits, do you mean: not added comments?
You can already separate out comments- from the Geeklist, click the arrow, then "Edit Subscription" (or set the default in your overall subscription preferences). Don't know offhand if that's item comments and/or GeekList comments; I turned it off a long time ago.