I'd rather see longer range (perhaps causing the accuracy of the barrage to scale- like the katusha). If it could barrage from further then I think I'd actually be able to incoporate it in to my playstyle. Having to get near point blank and completely expose such a soft unit is just too difficult for me. and the micro attention that is required to pull off a barrage and get away just isnt worth the damage it does. (thoguh once vetted up it does quite well).
It just needs a little more barrage range to help survivability IMO.
I'd doubt that alone would help much. In my experience, the SU-76's barrage is already horrifically inaccurate (tested it just to be sure, used it a couple of times, the barrage would frequently not even hit the center once.) when used at a range past a ZiS-3's barrage.