Personally I think they could take advantage of this sort of a change in a greater update that needs to look at smoothing out the story lines, and increasing the complexity of the way players interact with city areas (unique city laws, faction locked hostility which could be altered, unique bounty system dynamics).

So one example might be that you might need to attain particular status in a city through content like guilds, unlocking dueling in a city, unlocking summoning in a city without penalty. It's my understanding that the lore in this period sanctions lesser daedric beasts, typically for errands as an example.

No.

It shouldn't be illegal to have a pet in town.

It should be illegal to block interactions.

I suggest that the player with summons who would stand still blocking passage, door, crafting table, npc talking, etc., should get directly a bounty (for being rude and not controlling his puppets - which applies also to those invading bears, mounts, and mid-sized non-combat pets), each second.