Ok, categories are fine, but now we need to define rules. Ironman mode only isn't enough, you'll be forced you to play vs 1 AI and bless RNG for good spawn. I think we need to set 3-5 AI, it'll reduce random factor. IMO: Difficulty should be described too, but it's discusable. UPD: Presetting AI empires should be prohibited too.

Is that means DLC is't allowed? I found nothing about it in rules and used all DLCs except Leviathans.

I think we should specify constant rules about game settings for all versions. And game version should be a categoty, becouse on 1.9 you can beat any challenge twice as fast as 2.2, so you'll be forced to play on old version and its not fun. So version shouldn't be an option of run, but should be a categoty i think.