The Sherman may be added for TOD, but would see next to zero use in the MA. It was known as the "Ronson" by German tankers because it lights up first time, every time.
Seriously, the Sherman had inadequate armor and weapons. It was gasoline powered, making it highly explosive. It has a very high profile caused from trying to make it short and narrow.
It's main advantage was reliabilty and huge numbers, both of which are not going to help it in AHII MA. Any of our current tanks would eat it for lunch at any range.
IMHO, a waste of precious HTC resources to model it when so many other planes or GVs should be added.