@Joseph
“The rabbonim of a city absolutely have the right to enact and enforce a takana above and beyond plain halachic permissiveness.”
No they do not. It is either a gezeirah or a takanah and unless this is hora’as sha’ah, only a Sanhedrin has a right to implement a gezeirah forever or as Rav Moshe states that rabbanim may only enact a takanah for their particular locale and only for a short period of time (Igraos Moshe, 4:49).