1. Could you redesign the sprue in your Sherman kits so the two heads for the hull hatches have headphones on too? That's how the commander passed orders to them ... no such problem with your US crew heads who all wear the 'hockey helmet' type AFV crew headgear.
2. Could you include a couple of UK AFV crew helmets on the sprue - for the Sherman but also if you're re-doing the allied stowage? You see these hanging off the vehicles in so many 1944-45 pictures, and the shape is quite different to the Mk II and Mk III infantry types.
cheers
EC