Won't help. Has nothing to do with the unit. MP40s are completely useless, they deal no damage at any range other than melee, and in actual games, getting into melee range is impossible against anyone with half a brain, smoke or no.
Buff MP40 damage, for crying out loud, and do it across the board, so that Ostheer Assault Grenadiers actually see some use for once.
Assault Grenadiers fill a very niche role, and i think their sprint/Assault grenades ability make them a great choice for cqc and flanks (Good to overwhelm weapon crews for example). Imo a dmg buff could be a risky move and could quickly render them overpowered.
I think the mp40's package is defined by the smoke/nade ability (That was the intention, right?). Since the mp40's work well with these elements i dont think the package is bad.
However, adding sprint into the package and maybe removing an ability/increasing package cost could make the mp40's themselves more desireable and not represent a "downside". Otherwise the usability of the package is pretty limited.