--- Jochen: ---
there should be no option to drop those cowl MG's in any version since they were very rare modification
--- end ---
IMO a wrong conclusion even if it was _never_ done in real life - though we know it was.
I recon the removal of the cowl MGs was dictated by the environment the Fw 190s operated in: real life WWII. If they ( perhaps the pilot of the a/c in question? ) found the MGs useless, he might have them removed.
Same principle applies to a simulated Fw 190. Let the pilot make the decission wether to include MGs or not, if they are found useless in the environment of operations: 86 them.
To highlight the point and IMO the fault of your way of reasoning think of some other plane, say P-47. In WWII it flew x% of sorties with out any external storage. Should the AH P-47s be forced to confine to these limits? No. Because the fact that the P-47s had bombs loaded was dictated by the environment they flew in WWII, and so it will be in AH. I am surprised if we have same % of sorties with out external storages in AH as there was in WWII, but I see no reason why there should be though.
Wether the MGs were removed or not from a given plane is independent from something like production capabilities or such - infact it is totally the opposite it would have freed the MG 131 for some other use and their ammo if needed.
As far as rare modifications and their inclusion in AH: F4u-1C. I am willing to bet that Fw 190As with no cowl MGs encountered more enemy planes and downed more enemy planes than F4u-1C in WWII. Be the measurement total/number of planes, total/sorties or just pure totals.
//fats