Regarding bayonet charges, I read somewhere in the early stages of the Africa campaign in which the smaller British force defeated the Italians there were a number of battles in which commonwealth troops overan positions using the charge and cold steel. Regarding another incident Ive been reading a book about this BRitish horse racing trainer who used to be in the commandos called Ryan Price. The company cleared an woodland area of Luftwaffe/Navy raised infantry using a bayonet charge and nothing else(well apart from Price blowing his hunting horn!), which illustrates the psychological effect of such tactics against poorly trained troops.
As Im not really a WWII junkie I dont have loads of sources to quote etc so cant really put up any convincing argument. If you were to do the above in CMBO the Green/conscript troops would stay and shoot, and I doubt the attackers would recieve any bonus, which maybe they should do is all I am pointing out. Of course it would be difficult to model and you could end up with people charging left right and centre.
If you dust off your manual, you will see that it states that "stockpiling" of ammo is modelled in the game(under a section titled ammo I expect) Wether or not if it works or has been actually coded I dont know as I havent got the game to hand, but I am sure it mentions that this is modelled and once your troops move from their defensive postions they lose the extra ammo as they cant carry it, so the intention by the developers was there.