Balancing in the transport classes woul be nice to see.
I would realy like to have horse tranports implemented (patched into the "old " dlc aswell, for some enemies and the maps), as a very cheep (10,20 prestige) alternative to the opel blitz. At this point, the opel could be made more expensive (25-50 prestige additional). It should be not trivial to have only modern opels at the beginning of the war (I rememeber, in PG I realy struggeled the first missions to gain the prestige for beter tranports).
Further, selling back old transportation means schoul be possible, up to know you have to spend the prestige, first for the blitz, then for the sdkfz at full price again. I think this should be an upgrade path, though these vehicles are formally not upgraded into each other. Here, some prestige increase in the degree of the opel could be sensible. I just don't want to have to buy each vehicle totally new, and losing the oldfor nothing.
So "+ horse", "blitz more expensive", "upgrade to sdkfz"
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I further would like to have additional BF 109 types available, during one dlc (The drawback of one single dlc is, that it is kinda boring, upgrade wise). That is, different versions, e.g. of the 109 e in '39, each differing for 1 stat anywhere. E.g.
basis variant
e-1 could carry a little bomb, +2 ha/sa, -1 air defense/attack (slower now

), same prestige
e-7 specialise for heights, +1 initiative, -1 airfence, same prestige
e-8 additional tank, has more fuel (+20), +1 initiative / -1 air defense, +20 prestige
e-9 stronger machines, +1 air attack +1 initiative, -15 fuel, +30 pretige
(I know that the type declarations are not that correct formally, but I think you get my point). Obviously they should be in one upgrade path. So you can customize your core, more, I would realy like to have some choices there. You could easily implement that (same picture for all of one type), even for later dlc / equipment variants.
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General balancing, I would like to be ale to customice them more. E.g. a menue where I can chose which level of the ki I want, and for the bonus settings, how much of them I want (in percent, like I would like 10% less available turn, 25% less pretige, 1 additional strength point). SImilar to the prestige options in PG.
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Specifiy balancing, since there were some complaints about the early german tanks, I think the attack values are okay, but one could give them some +1 / +2 initiative. They were weak, but hat an extraordinary good communication. Maybe that would help to use them better.
The difference (prestige) between 7.5 and 10.5 sould be bigger. +1 range is realy a huge deal. Same like with transports, it should not be trivial to get /upgrade everything to 10.5 instantly.
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And some statistics evaluation of each single map / of the whole compain is realy needed (maybe at least a table about all dv/mv/loss awars and the units death/kill statistics, like in PG). Same goes for multiplayer. A replay function is realy missing there.
Best regards (experiance have all been obtained on fm level)
Ranta