IMO you shouldnt be able to use SUPPORT weapons alone, they should act and work with cons/grens because they are SUPPORT weapons...
+1 for valid point.
MG and Maxims must work together with infantry.
For example, you see a cons squad charging your mg42 to oohrah lolotov. Obviously, their path is predictable because they charge in straight line. If you have your grens supporting mg, you can shoot a rifle grenade right in their path and kill 3 of 6 models. Start moving your mg. Deploy and suppress while grens keep conscripts busy.