5.1.: Compact Enforced: This will prevent the Infernals and Basium from entering the game. I'd like this to be on, but it will make our second switch likely to be to the Infernals.
5.2.: No hell terrain: Hell terrain really screws my computer, so I don't like playing with it. But I wouldn't mind it being on, since patience is a virtue ;p.
5.3.: Permanent alliances: I like checking it when playing high to low, since it helps to save situations that are almost lost. It makes the game easier, most of the tomes.
5.4.: No Acheron: Acheron is a bad choice for this game because the AI can handle it. Some civs are likely to get destroyed by constantly suiciding troops trying to kill him. So I vote to check it.
5.5.: Living World: Events are always nice!
Perm alliances is fine, but if you want perm alliances you need to have leave off Compact Enforced and have tech trading be normal. Acheron is simply annoying really, and lacks epicness plus I hate having to wait for Spirit Mana.
Hell Terrain is good, leave it, I wanna screw with my enemies.
Living world is fine if it makes you happy.
Oh, and the reason we want to start out as Illians is because we cast Stasis on Turn 3 and soon after we are the #1 Civ and we switch out to the next Civ, making this Succession High to Low game easier.