If Jousting and War Horse are enough of a distinction, then fair enough, I think we can roll with it. Perhaps moving that +2 SPD to +1 SKL, +1 DEF or something like that (or just +1 SPD +1 DEF to let them get SOME speed benefit from their horse). As for Quickdraw...once again, fair enough :3
Now, for Sanctuary...
What the Zone does: You pretty much got it with your understanding of it; it requires the Bishop's action to erect, no one gets in from the outside, attacks from outside cannot be made within, and attacks from inside cannot go out. Although, there was one other stipulation I had in mind: attacks inside the zone cannot be declared, either. It's essentially an "everyone play nice" zone, making the area sacred, and thus, holy ground that won't have blood spilled upon it. There are still several actions that can be taken within the zone: Performances, Healing, and Buffs primarily. These can also affect people outside the Zone of Sanctuary; if a Dance or Play is in range to affect an ally outside the zone, it can; if someone has a Physic Staff or any of the Buff staffs, they can use it from within the zone to target those outside. Debuff and Ailment staffs do not work inside or outside the zone, though; using holy ground as a shield to influence your allies outside might be questionable, or, charitably, pragmatic, but hiding behind sanctuary to cripple your opponents, including driving them insane or poisoning them, is just a dick move.
There's also passive buffs and debuffs that aren't affected by the Zone of Sanctuary: bonuses from Supports, Personal Skills, and Charisma can all affect anyone in range outside the zone, and you can still Daunt an enemy or trigger their own Personal Faults if applicable even from within the Sanctuary.
How the Zone is maintained: Speaking of using Healing and Buff staffs from within the zone, hopefully that means you had another staff user in there with you already; like you assumed, it requires constant Action from the Bishop to maintain it. Even a Performance wouldn't allow the Bishop to take a separate action during their turn; the only other thing they're allowed to do besides Move or Maintain is Trade. Anything else and the zone drops at the end of the current Player Phase.
Moving the Zone: That's the right interpretation.
To prevent a wall of text in the character page, I'll only update Sanctuary to include the line about Maintaining the field. For every other rule and errata we discussed, that will go in the Special Situations rules. With diagrams. I like diagrams.