They could make the SU-76 like the pre-patch StuG G, which would actually be reminiscent of it's real-life use. I don't think anyone would use it then though, because it'd overlap with the T-70 and Quad which are both already hard AI.
As I said, Sherman Jumbo looks the same as Eight Eight. Do you really want 4 Sherman variants, where as the Pershing looks much more unique and appealing?
The Jumbo is noticeably bulkier than the Easy Eight, and has a larger reinforced turret.
And yes, I do want a Sherman variant over another ~rare tank~.
Stormtroopers could be given Obersoldaten rifles. They are supposed to be special forces, after all. I don't own Stormtroopers but if I did, I wouldn't consider them worth it aside from their infiltration, which is of course useless once they're already on the field.