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I have been playing a lot more team games recently as both allies and axis and I have to say +1 to this thread and especially to PwnageMachine.
There are some specific allied strategies that work on specific maps and snipers still work even in 4v4s but generally you are on the clock as allies and you have to completely win in time too, not just secure a big advantage. For example even if I bleed my opponents dry with double/triple sov sniper BS all game (yeah I do it, it`s not my fault it`s in the game), getting vet 3, denying map etc. if the axis is not completely wiped out their dominant late game just comes as if the previous part of the game hasn`t happend at all (while in 1v1 it would be pretty much gg).
It`s obviously hard to balance the game across the game modes but some things could be done. First of all the PwnageMachine`s suggestion of making maps more spacious and flank-friendly without increasing retreat distance would be amazing if implemented. Then the income could be tweaked for larger team games only, or fuel/muni caches could be taken away from the game. They are largely irrelevant in 1v1s and just mess up team games (and are one of the reasons why OKW/OST is better than just pure OKW). Such changes would help without inflicting collateral damages on 1v1 balance.
Than there are the general balance issues/propositions which would influence 1v1 but might do so positively. Yeah I know this is subjective and won`t be agreed upon. But what I would like to see (among other things, but this is too long already) is soviets being able to play straight up and on the other hand their cheese being limited. For example I would like to see conscripts being made somehow more effective (consequently the presence of AT nades would help allied late game in team games) and on the other hand snipers being limited to 1 squad at any given time.