Something I think would be really cool to see would be more early machine guns. Add like an early maxim machine gun with 100 round magazines. But have the machine-gun be like the mortar where it has to be deployed before it can be used. So the gunner would either have the weapon in his hands or on his back, but needs to set up the weapon before shooting.
The German MG08/15 could be added for the axis.
The American/British could get the M1909 Hotchkiss.
The Soviets could get a Maximgun.
These weapons would be much more mobile than the MG emplacements, but would still require being set up before being able to fire. So you wouldn’t beable to run and gun from the hip. You could even add the over heating ability to the gun so it wouldn’t be to over powered. But would add lower level machineguns to make the combat more dynamic at lower tiers.
ah well i am going on the assumption the devs will make it so the user can only ads if bipod which will lead to most players use it as an assault rifle…though if we go with your idea then i am afraid most people will abandon it