Most of us already have a maximum number of Narcos for each production job. In this case, we always have to add 1 worker for Street Crime. Is it possible to automate this? It could be a priority for the Doctors Office, but if its full, then Narco is added to Street Crime.

Strong agree with this, even for those of us without max prods. Being able to auto assign new narcos to existing productions with existing space would be a great help, with manual reallocation still possible through the production tab.

Or maybe we could have priority set from right to left to allocate all Nacros on auto.
If no,  then stick to my original suggestion + we can make production "hammer" icon green when our auto allocated Nacros ifrom Street Crime have an option to fill other productions that can hire more of them. That would indicate we still got something to sort there. Our green hammer should have no effect on our switched off  production with 0 workers and stay white.

Agree. Lock it behind completion of Business Management & Narco Training courses.

I agree with this especially what DAN said.

Make it some sort of perks that needs to be unlocked via education or something 

I can see this being a nice QOL improvement. Initially I'll likely allow auto applying to Street Crimes just to make it a bit simpler to implement, but longer term I'd have no issue improving the system.