Hey Greg,
which reads
Did not realize there were different Google groups. Will repost there.
And to be clear, I'm not sure what I posted isn't a bug, as it does appear that managedsoftwareupdate is "forgetting" the settings from the .plist file over time. But I am not at a point of being able to claim it is a 100% reproducible issue as it so far has manifested multiple times but on one system only, and it occurs after an indeterminate period of time. I know it shows up within a few days, but not sure if it's happening soon after, a day later, etc. Will test more as I can, but it's disconcerting that this is occurring at all.