I dunno - in my head it worked like this... a group owner could establish a remix album for that group (just the one) that pulled from the pictures in that group). Up to the group owner to set it up, then members of the group could comment.
Actually, just being able to put comments in group photo albums would be pretty badass... perhaps it's not so much work to switch group photosets to become group photo albums? There'd likely be some great comments under photos after events, and they'd be more in context than just talking about it in the event thread...
If I had an idea, a cool concept...how would I go about proposing it, as I cannot program anything worth crap...but I know that it is a cool idea. I have everything pretty much setup for it...but wanted your personal opinion first