From: Houston, TX
From what I could gather from the manual, the "New Turn Rules" seem to be aimed at smoothing out certain advantages / disadvantages of game calculations that used to be run only at "end of turn" in III and earlier versions, rather than at "end of move" in TOAW4 with new rules on, so I thought it would be fairer to leave them on.
For the supply, I think "old" supply rules would be best b/c that will (I think) tend to make the boards more "even" (thus giving everyone as near the same supply aspects as everyone else, and also simplifying that supply aspect for those of us [like me LoL] that are not supply experts).
Scenario variability will have to be on b/c of the game events that are involved.
Note that the scenario has most rules preset as shown. Players can, of course, override those presets, though.
Two rules (Variable Initiative and New Density Rules) were too new and so not set yet. But, if the scenario is played PBEM, Variable Initiative doesn't matter. New Density Rules should be used. There is no preset for Trusted PBEM, but, for a tournament, I would turn that OFF.