I´m in the same boat as Bonners. Finishing up a Trappenjagd campaign and is a bit disappointed with the German AI: The date is September 1st, Kiev is taken, and Odessa cut off, so the game is essentially over.
In Case Yellow, I had a blast playing as the Allies, trying to retreat in the face of and overwhelming force. I had expected the same from Trappenjagd: A frantic retreat, trying to conserve my units, and build my strength, until I could turn the tide. Unfortunately the force disparity in Trappenjagd does not afford the AI the ability to do this.
I would like to see a variant for these scenarios where the Soviets start with lower supply income, that gradually rises as the scenario progresses. This would hinder the Soviet player in going on the offensive, other than local counter-attacks, before the Germans have a chance of penetrating their lines.