IMHO I think the grenade launcher should have scatter (a human is aiming it ).
However, it should be half the scatter you get with hand held grenades.
Scatter should depend on the thrown distance. It’s much more difficult to aim if you’re giving all you’ve got.
And please, a warning if you risk hitting a friendly target. And also, warn if rookie can fumble grenades, I really hated having my heavy without a weapon in the mission where I had to face 2 queens (in BB4, haven’t faced one in BB5) because a rookie sent the grenade when I pressed the button to aim a grenade.