Sadly, this mod was abandoned before it could have any changes to the commanders proper. All that was included at the time of writing was Festung Armor and Guard Motor Coordination.
Elite Unit doctrine... I'm guessing that's the pay for vet thing? Or I might have heard whisperings of every infantry unit starting with veterancy 1...
Tiger Ace (if it was in that commander at the time), I assume, was the version where it was free (or very cheap for it's performance idk wasn't there) to call in but took away all resources until it died?
EDIT: Soviet Industry. Did this give you access to the T34-85 at the time? Honestly when I was playing, fuel was never a limiting factor to making T3476, it was always manpower. And from what I saw, soviet industry increased fuel at the cost of manpower.
So how was this OP? Very early T34? KV-2 spam? I wonder.
Original Tiger Ace was 100% free and it froze your fuel and manpower income for as long as it was alive, so people used it for an all-in push.... which worked most of the times because back then the Tiger Ace could easily solo three SU-85s: it had very high armor and SU85 pen back then was not good, it had seemingly endless HP, and the
PaK40 stunshot ability on top of the very lethal vet 3 performance with Blitzkrieg and smoke. If they had let's say a couple Panthers or P4s on the field at the time the Tiger Ace arrived, it was pretty much a guaranteed win.
You could buy veterancy too, that is correct. 80mp and 25 fuel for enough veterancy to turn a fresh gren squad immediately into vet 3. Funnily enough this could also be used to buy veterancy for your (OKW) teammates and OKW veterancy was very OP in the first years of that faction.
The original Soviet Industry did not have t34-85s but as you mentioned it had an ability at 0cp that boosted your fuel income by +50% at the cost of -33% manpower income. It also increased vehicle production speed by x10 (1000%)
The T-34 was in t3 back then so you could bring it on the field before the Ostheer player even got his building out to construct pak 40s or panzergrens... you just couldn't spam infantry with that doctrine, but you didn't need to anyway.