I have a fairly complex IMAP tree with lots of folders and sub-folders. Thunderbird periodically resets the sorting of messages to earliest message first, and now also "threaded" view has become some sort of default. I have to go through each folder and reset the sorting the way I want it, which is a painful process.
It should be possible to set sorting of messages as a global function. And not have Thunderbird arbitrarily reset them later, but at least give the user the option of setting them how they want, easily.
Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.