OSTHEER IS DONE WHEN IT'S DONE!
Hammer and sickle is too small on the ingame flags anyway. I'd be in favour of dropping the 'national' flag in favour of something a little more CoH, like the Star in a circle for the US, RAF style Roundel for the Brits, Iron Cross warflag for the Germans. I'd probably use a variation of the Red Army flag with a small hammer and sickle in the centre.
What an incredibly important and potentially gamebreaking detail...
New stuff for soviets:Soviet flags[...]