of course then you shouldn't touch it.
deleting is not completely possible i think so you end up have millions of nearly same submissions just because you forgot something to add to a submission.
i don't see a problem here with this. you can clearly see in the moderation log when a score was edited last time. so, when a score from 2007 was edited in 2011 it has to met the rules from 2011 or it will be blocked.
just use the cards one an old agp 2x system (k6 or p2) and there should be no problem. you can't fit the very old cards (agp 2x) in a agp 8x board anyway.
most 3dfx cards (voodoo3 xxxx, voodoo 5 5500) are for sure agp 2x.