i think the lmg42 is fine. it is strong, but only if the grens don't move, otherwise it's a liability. there are various ways to force them to move and it's a significant munitions sink.
control and the number keys work individually; they do not work together because precision x has them bound to profiles and it's intercepting all ctrl + # presses.
the biggest difference between dow2 and coh2 in terms of vps is that you HAVE to go for the vps and cannot allow triples caps in dow2 or you will lose very fast. in coh2 focusing the vps will often be more harmful until the late game.