I'm working on a research project right now to address the vehicle aspect of AHII. Given the number of vehicles produced/used during the war, I think such a project needs to be undertaken with a global view, not with one-off suggestions.
I agree that there need to be early-war light tanks in the game, but as an example, the Russian T-60, one of the most produced vehicles in the war, was a scout tank with a 20mm SHVaK cannon, the same gun used in the La-5 and La-7. Even though it was highly produced (over 5000), it would add little to the game next to the (primarily) 35mm cannons of it's early war peers.
I anticipate I'll be done with this project and look forward to posting it for comments sometime in the next few weeks.