I prefer Speed but Difficulty is OK. This is terms of Gauntlets. Challenges should remain as is for the most part, other than previously agreed to changes. Again, my suggestions was 4 Gauntlets - 1 for each speed - with rotating difficulty levels. With 4 Gauntlets you'd have a good mix of easy to high difficulties. You can flip-flop difficulties with each new set of Gauntlet such as Setter/Noble/Monarch/Immortal and Warlord/Prince/Emperor/Deity. (Chieftain can flop with the Settler or Warlord spot every other set)
Definitely require leader. Glad to see folks advocating this point. No point in banning leaders if you require leader and cycle through the list....even Incas. This way not everyone chooses Egypt or India every Gauntlet.
Question: Are later era starts even stored in HOF tables? Not saying not to use them...they are a fun change of pace, but I can find no record of late era games. Anyway, I think later era starts can be saved for the Challengers.
Again, my point earlier was to keep Gauntlets HOF table focused and Challenges focused on more unique game setups for fun and change of pace, not that some of those games would qualify.