1. As topic says, the suggestion is to avoid stupid situations like being chased by 10 guards from BH caravan site, while it's TC zone, so make NPCs go out of city when the TC starts, to avoid getting attacked by players, or to avoid getting blocked by those NPCs if you accidentally hit them.
I would suggest doing this for Redding (Ascorti's guards), Den (Slaver's guild), BH (Caravaners).
Make them hide in one building and make it close for the time of the tc, or leave the city.
I think it won't be abusable in any way and would just help players in TC.