I dont get your "argument". You want to make scott barrage as effective at wiping squads as stuka and pwerfer but taking away its 400hp, autofire and smoke? Deal.
My game experience shows that:
-StuKa-zu-Fuß is good versus a column of light units, it will kill with ~30% a support-weapon by a direct hit. With luck you will hit with multible rockets and kill it directly.
-Panzerwerfer is good versus blobbs, will kill a support-weapon with 2-3 hits, at close rage the potential is very high.
They are really good, but in a comparison Scott is also able to kill a support-weapon with 2-3 shots. And because of its accuracy and frequenz of shots it will do so. It can't stop a hole assault of infantry-men, but it will bleed support-weapons and small-units same as e.g. a Panzerwerfer can.
BUT it is able to kill units in run, with very less micro.
It is possible to handle that, if you reduce your inantry to a minimum. So many people scream for changes, so why:
I think it would be interresting how it would perform, if it gets same projectile as StuG E, slower speed, less accuracy, but with higher angle. All for more aoe-effect. So it would still work good versus support-weapons, but can't hit running units anymore, because of slow Shell "hit-Ground" is more difficult to manage.