Does someone knows of a mod that restrains the number of NAPs per neighbourhood to only one?

Almost one year after... someone? ?

You don’t need a mod. You can restrain the number of NAPs in a neighborhood by shutting off NPC voting. Then the only NAPs that will be enacted are those your sim votes for, or that you cheat into effect. So, if there are multiple NAPs in effect you can use the cheat to repeal all or most of them, then you can have your active sim vote for the NAP you want, or cheat it into effect and only have the one active.

Thanks @Pamtastic72 so simple yet i didn't even remember we have the nap's toggle...

You’re welcome ☺️.

Remember you might still get notifications after you disable npc voting that _____ NAP has been enacted, but if you check you should see that it’s still only the one you chose and no others. I think the notification thing is a bug.