Bug: Just went and did a complete reset, not the prefered method, but it didn't remove everyone and worse yet it left 3 names in that haven't been in the guild in some cases for months.
It actually keeps people in the list that checked the box for "My Availability doesn't change"
Sounds like I need to add an option to clear all availability.
But all of your suggestions are sound, as is the CSV one that Keystone mentioned. Indeed I'll be tweaking that stuff as the Raid Availability is in dire need of an overhaul. It's outgrown its clothes and needs a whole new wardrobe.
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It's all in the reflexes.