Just based on my rather good understanding of WW2 weapons and tactics, I would think (apart from general interest in technical accomplishments – I do know that the first German helicopter demos were treated as a spectacular achievement) the first tactical foreseen application would be supply & troop transport (especially commandos) in difficult terrain and for accelerated tactical speed, which were both things the Germans were interested in and developed systems for (e.g. airlift, paratroops, motor/mechanized maneuver-based tactics). The first helicopters would no doubt be very vulnerable to attack from ground and air and artillery, and so I would expect them not to be used for direct attacks. A recon role for counter-insurgency is a good idea, though – their recon aircraft tended to feature very low speed cruising, and against partisans could afford to be visible to the enemy if they flew high enough.