Why can your scenario only be played PBM? Why don't you make it playable against the computer?
This is primarily a limitation of the game engine. Basically we ran out of events. The design engine limits us to 500 and we would need thousands of events to make a PO play considering the huge numbers of variable
strategies available in this scenario.
There are a number of all WWII TOAW scenarios out there playable against the computer. In my opinion the best by far is Patrick's 39-45 for TOAW Vol. II. Given that scenarios exist out there that can be played
against the PO we chose to focus on making the best PBM game we could instead for truncating it to allow for a PO.