I agree that all the tanks with commander cupolas should get a binocs view (doesn't need to have arty spotting ability) like on the Stug. Would be helpful for spotting targets for the tanker and coordination.
However tanks with just commander hatches like the early Shermans and Crusaders shouldn't get this ability, but they should rely on their commander sticking out with his binocs.
Basically I say give binocs positions to every tank that currently has a buttoned up commander spot.
EDIT: also FHSW did this and I find it a very cool addition, even if it's use is limited in good ol' 1942.