I use Thunderbird on Ubuntu Linux and have just upgraded to Ubuntu 10 / Thunderbird 3. One of my gripes however is that Thunderbird uses a number of shortcut keys that have no secondary key requirements, for example, "Mark as Read" is M. Not ControlM. Just M. Worse, "Mark as Junk" is J. Which means I sometimes inadvertently mark messages as Junk.
How can I customize Thunderbird's shortcuts so, for example, "Mark as Junk" is ControlJ?