First, I thought this was a fantastic project. The fog of war as seen through the various AARs was fascinating. I am definitely interested in participating if another campaign is started. (preferably as a field general)
Six active players is the right number. If additional people are interested, assigning advisors/standbys would be a good idea. They could be expected to add additional commentary to the AARs, fill in if there were a need, and provide a core group for the next campaign. That might also help keep the pace at 1 turn/week.
In regards to personal preference for the AARs, I think I enjoyed jimwinsor's the most. Not just the writing; it also had a lot to do with the consistent (and reasonable) size of his screenshots.
I would suggest dropping special rules 1 & 2. IMO limiting movement that way is gamey in itself, and AACW has matured enough that its really not needed.
And I agree, don't put all the grognards on the same team.