Ideas how to improve WinSP MBT/WW2 !

[Marek_Tucan]

Just to add to the helo section, it's about the same as APC. Primary mission of transport helo/APC (even if armed) is to carry grunts to battle and their armament is for self-defence or support of their dismounts.
Now of course if you want you can get them into harm's way and use then for scouting or as mini-tanks (or mini-gunships) but then one hidden infantry squad with good nerves can at worst shoot them down, at best it can shoo them away after damaging them. Plus, contrary to APC's that tend to be smaller than tanks, transport helos tend to be bigger than gunships, so are easier to hit.
heavily armed transport helos (Blackhawks with Hellfires, Ka-29TB...) tend to be fragile and expensive, just as IFV's are, so there's again that balance - heavier weapons make the vehicle more powerful, but OTOH distract from the primary mission and usually have cargo capacity penalties. And in threat-rich environment (plenty AAA or AT weapons) they both tend to die quickly if used carelessly.