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No Message Pane Sort 1.5 Requires Restart
No Message Pane Sort prevents accidental resorting of the message pane by disabling mouse button clicks on the column headers, thus, locking the sorting order of your emails.
It is still possible to sort messages by ctrl-clicking the header.
About this Add-on
Then No Message Pane Sorting is the addon you've been waiting for. It disables mouse buttons clicks on the message pane headers and your message list stays sorted all the time. But just in case you do need to resort your messages: You can still do it by ctrl-clicking or command-clicking on the header.
I'd like to thank you for using this little addon. If you have questions, please, let me know.