This would in my opinion by far too unbalanced. A German force that can attack non-stop vs. a defender with hardly any chance of making any countermeasures just doesnt seem fair.
Leaving the multi-clicking and pre-planning as it were seems like a much better idea.
Before reading on: It is late in the evening here, and I'm tired, so I didn't read your entire article, or the majority of replies, so this might already be answered.
I read "Maneuver Warfare Handbook" (1985) By William S. Lind recently, and I got the impression that the "Blitzkrieg" tactic consisted of letting a strong unit force the crack in the enemies defences, and then pouring the reserves into this breach and exploit the initiative gained. This way, several "spearhead" units could attack different weakspots in the enemy lines, and the reserve could exploit the most suitable or successfull one. This way the defenders would face multiple attacks, not knowing which area to support with the reserve, plus the attackers would have several options as to were they should commence the "Blitz".
However, this might be awefully wrong for all I know