I would love to see more side grades in the game like UKF have. An Ost option to spend some manpower and fuel to get 5 man Grens/pios would be awesome.
I am wondering if such an option - even if it will cost mp or mp+fuel - will not put soviets for instance in disadvantage. If such an option will be available in a tier (2, 3 or 4), imagining a vetted gren squad that made it to late game which will receive an extra model sounds like curtains for soviets and will have the same impact: if you made it with axis to late game, you have the first chance. And there will be more than one I guess.
If it's a side upgrade UKF style that can be given from the beginning, this may create another problem. It is largley believed around here (and I assume it is correct) that the 4 models DPS should be spread among the 5 members of the squad which will automaticaly imply that the initial squad (which will still be 4 models) will actualy have less DPS than now. So this upgrade won't be a side but a mandatory one, translating into the fact that if you chose not to give it, you will be at a great disadvantage. So this solution will actualy translate into a suplementary cost for Ostheer right from the bath. This can be achieved by other meanings, like making the squad more expensive, initial start resources, etc.