[Artur]

If you pop up in the StuG's view it will be able to shoot at you. If it kills you you desrve it. However if you do that outside it's view than you travel faster than it can turn and you deserve your kill over the StuG IMHO.

What will lead to if this is going to be implemented?
Players will have to attempt for long range engagements, this way it will be hard or even impossible to flank the StuGs. Especially if the improvement about OP fire setting will be implemented they can be very effective at long range.
If they are going to chrge they it will be a different story, they get close to the enemy and can be flanked easily. Assault guns are defensive weapons, or support weapons not the ones to lead the charge IMHO.

Of course theye can be a penaly made to only react after a LOT of triggering events mentioned above it depends on how easily it can be implemented.

Artur.

PS: Think about how they are used in CM. Seasoned players always deploy them in the rear, especially in the corners to always have their front threatened only. I suffered great losses while chrging with StuGs in CM (a'la SP) and I fully deserved it.