PBEM Set-Up & Ground Rules

[RERomine]

I'm working on a PBEM doc that basically outlines all the various set-up options, information and ground rules for a game. I know what I find important, but I'm looking for other opinions as well.

What ground rules to people generally find important for PBEM games? There are some basics, such as limits on air sorties, artillery, ammo resupply, mines, force realism, paras, etc. I'm looking for any information that someone has felt the need to bring up to keep the battle either real or within expected limits.

The doc has been attached if anyone wants to take a look.