It's your dream of course but I also don't like the auto fire stumtiger. Perhaps altering it's profile so it's OHK is reasonable (something like the various 15cm guns in the game) with a wide AOE that damages and perhaps applies a stun or suppression on infantry. Then it's a blob stopper instead of a simple game changer. It would still require support to do more than force a big retreat.
I just think that an aurofire Sturm would seem silly and oppressive or silly and see as much use as the garbage one we have now post neutering.
To be fair the modded one is just a less micro intensive and more consistent version. It still takes time to aim and can not fire on the move but easy to track units. It has a higher rate of fire but deals less damage. It will still deal with blobs but very well as well it is able to support armor. In comparison to the abilities it is just a right click like repairing but with a long 22 second cooldown. The health and the stun could be looked at.
It still generally retains the fighting capability vs infantry. It is slightly more powerful than the brummbar 15cm but does not wipe at full health in general.