If wishes were fishes...but what the Hell! I would like to see an engine that uses a higher level of opereations. The smallest units being platoons. That way there would be no such thing as Off board artillery you would have to set them up. The possibilities are enles. Battlefield re-supply, engineereing enhancements (finally get to use all of those funkey British engineereing tanks! ) twenty four hour battlefields, paradrops, etc..etc...
I used to play alot of Command Decision so handling a division or two over a two day battle sounds like fun.