Perhaps it could be added back as a separate entity.

C menu -> right click on the nebelwerfer tube and tick the option to fire everything at once

+ forgot to say you can do Reload + Use on a cannon / the nebelwerfer to fire it without aiming

Thanks for the advice, but it still doesn't fix what I feel are the problems:
- the barrel cluster cannot be manually adjusted with the physics gun
- the rockets do not arc
I understand that the standard aiming system has its advantages, but for the nebelwerfer, I vastly preferred the old system. This allowed for large numbers of them to be chain-fired as indirect artillery.
Perhaps I'm just picky, but I don't think the nebelwerfer is nearly as useful now.
At any rate, thanks for making this mod. I hope you accept my criticism, but even if not, I'm happy that you've made one of my favorite mods on the workshop - defensive emplacements were sorely lacking until now.

i didn't like the adjustement of the barrel with the physgun while I could just press use, aim, leave the nebelwerfer and press reload + use on it
if you want the rockets to arc, you can decrease the maxrange slider
https://i.imgur.com/O7norGY.png