I want to know if you guys think this is worth making a full suggestions about the IS 100.
IS-100
A prototype version armed with a 100 mm gun; it went into trials against the IS-122 which was armed with a 122 mm gun. Though the IS-100 was reported to have better anti-armor capabilities, the latter was chosen due to better all-around performance.
I agree with adding that tank. I included it in old suggestion of mine long ago.
It would be a huge fire power boost for Soviet tanks and finally put them on par with Tiger II, since the IS-2 is usually not effective with its long reload.