easy to modify things online, or call if you are so inclined
are you asking if calling affords different inventory? That answer is No. As with WDW they see the same inventory
true, it can change. My thots, any changes in rate availability/pricing is generally a result of cancelled reservations going back into inventory.
additional AP rates appear to be coming out more short term & exponentially higher
It is nice to read there that AP rates are finally popping up thru early June, just need to see more of them!