Well, I for one am willing to admit that I don't have the slightest clue as to what is feasible for HTC
.
It was wished for, that troops didn't look and move like Frankenstein. Look at what we have now....
You say, that in order for these ideas to be done properly, a whole new world needs to be created???
Oh well, I guess that you haven't noticed that your tank suddenly springs back from laying on its top and is completely fixed from clicking on a text box in the corner of your screen.
Even if like Smokin' says the troop animation attacks hard targets like field guns and other buildings rather than running to the maproom and kicking a cloud of dust as they do now, I don't believe that would break the game engine.
But who knows.....
I am just saying....... there could be a great leap in fun and overall strategy with a different use for troops.
If HiTech doesn't want to dick around with the main arena, he could possibly give it to us as a custom arena option, or even one better, replace the duplicate game mechanics in Early and Mid War with something NEW. WW1 trench warfare hmmmmmmmm........ 
The vehicle supplys have nothing to do with this. Its a completly different section of the game, much more closely related to how aircraft can be completly rearmed and refueld in 30 seconds. I'm sure the only reason the vehicles don't take 30 seconds to fix and rearm is because they're intended to be used beyond the cover of the auto-ack, and because they have absolutely no cover from enemy tanks.
And a whole new world WOULD have to be created for it to be done
RIGHT. For infintry to have any significant place in the game, the entire game dynamics would be changed.
Aircraft would no longer be the main focus of the game, they would simply be support for the infintry and tanks(Aircraft could no longer take a base on their own, they would need people fighting as infintry to take a base)
Ships would only be shoved even further into the supporting role, the entire goal being to provide a base of opperations/support for the aircraft, which are themsevles supporting the infintry.
C47, LVT, and M3/SdKfz 251 drivers would become simultaneously significantly less important in the tactical picture, and critical in the strategic picture: You would try to keep the M3 or goon alive as long as possible, but as long as he is close enough for the troops to walk to town, their deaths are much less significant. But they would be much more important strategicly, since you would need to get enough M3 drivers together to move the infintrymen the 30-odd miles from base to base.
Tanks would no longer be important simply for the fact that they kill other vehicles, and can deack bases/towns. They would be important for the support they give infintry, and because they can kill other vehicles (which would be usefull only because those vehicles provide support for enemy troops). Only here would it truely be a mutual support system. Infintry would help keem infintry away from the tanks, which lets the tanks do their job more effectivly, and their job is helping the infintry do ITS job more effectivly.
The importance of the field structures would be diminished overall, and the vehicle hangers/barracks would be the main target for a bomber raid, as opposed to aircraft hangers, radar, and ordnance.