I'd like to see the MG's of a tank linked in some manner, especially the hull and co-axial MG's as I can understand not linking in the pintle MG due to it not being used generally while the crew is buttoned up.
The 2 MG's (of separate calibers, I may add) on the LVT2 are linked, so why not the tank MG's? The benefits would be to rake fire over running troops, help take down a building or 2, and maybe with a bit of luck destroy a jeep, M3, M16, or SdKfz 251.
Oh, and at this time I'd like to also wish for (again) many many more variants of the M3 and SdKfz 251. Adding in an M3/T30 HMC (Howitzer Motor Carriage) with the 75mm or 105mm HE cannon, or the M3 with the 3in (76mm) AT gun would be "easy" and fun. Also, the SdKfz 251 had a huge number of variants as well. The 251/9 (75mm Inf gun), 251/2 (81mm mortar), 251/22 (75mm PaK 40 AT gun!). The base is there, lets branch out!!!