On another note, the actual 1939 platoon structure seems to have actually consisted of three rifle squads of 13 men each (plus platoon HQ and mortar section):
http://www.bayonetstrength.150m.com/...0to%201942.htm
It might be worth keeping in mind that most of the German platoon/company TOEs in use in this game tend to integrate the 50 mm light mortars and their personnel into rifle squads, rather than featuring them as small teams of their own. This is certainly a pretty pragmatic approach, since moving individual 50 mm mortar teams around is pretty fiddly, and they are not very likely to achieve much on their own.