This idea is probably beyond the scope of HOI, but hopefully will be implemented in a patch or add on would be corp attachments. Most of the real interesting goodies in WWII such as heavy tanks like the German Tiger, Soviet KV-1s, and Soviet JS I-III, heavy artillery (US 203mm, Ger 170mm), rocket launchers (German Nebelwerfer and Soviet Katyusha), heavy flak like the infamous German 88mm, and of course the heavy tank destroyers like the German Jagdpanther and Soviet SU-100, SU-122, and SU-152 were organized into independent battalions/regiments/brigades attached to a higher level head quarters. Based upon King's AAR you seem to have flexibility in determining the number of divisions per Corp, it would be nice to have the added flexiblity of adding these elements that I have mentioned to give a Corps added firepower not to mention a degree of military/historical authenticity.
On an asside, did anyone notice in the screen shot showing the allocation of panzers for a panzer divsion that above the tank icons were different NATO style icons for engineers, signals/communications, and I think artillery. If you have the ability to "build" your divisions I will be exteremely pleased. Also, if this is the case then my suggestion would not be too much of stretch for a future update.
On an asside, did anyone notice in the screen shot showing the allocation of panzers for a panzer divsion that above the tank icons were different NATO style icons for engineers, signals/communications, and I think artillery. If you have the ability to "build" your divisions I will be exteremely pleased. Also, if this is the case then my suggestion would not be too much of stretch for a future update.