It is possible to get 5CC games onto the HoF. I've definitely got one at the moment. It's not a 100K game though! (My first milk game was an OCC and that's still on the Histo charts.)
Thinking about it though, I guess that we could do a variant game for the gauntlet. However we might not be able to check the games suficiently to ensure that the variant rules have been adhered to (we only check the HoF conditions), so it would have to be honour based.
5CC domination? Hmmm. I'm playing a 5CC game currently where I have 200 domination tiles and if I decide to attack the Americans I can increase that by another 20 or so. If I had spaced my cities out a bit more that figure would be even larger. On a Tiny map you can have domination limits under 300 tiles so maybe I'll give it a go. (But not on Sid level!)