This will break your thinderbird! What you are looking for is keyconfig 20110522 Bedømmelse: 5 ud af 5 stjerner

I installed this, and this will break Thunderbird 31 completely (see:http://www.thunderbird-mail.de/forum/viewtopic.php?p=372179#p372179).
In case you installed this, you have to restart Thunderbird with "-safe-mode" te disable this again!

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What you are looking for is the "keyconfig 20110522" Add-On, that is old, but still working:
To install this, you have to :

- right-click on the first word "keyconfig" in the old first forum post from "April 30th, 2004" to get the keyconfig.xpi file form here: http://forums.mozillazine.org/viewtopic.php?f=48&t=72994

- open the settings for the extension "keyconfig 20110522", there you can change all key-shortcut, you like (for example disable single-key-shortcuts or "Ctrl+Q", which is my favorite ;-)

(My 5 stars count for that great Plugin)

Bedømmelse: 5 ud af 5 stjerner

I really love it. This is why I did not change to Thunderbird 3.

There is a small problem: keyconfig was updated.
So the "http://mozilla.dorando.at/keyconfig.xpi" link points to a new version that is not compatible with Thunderbird 2.0

Bedømmelse: 3 ud af 5 stjerner

This extension depends on the separate keyconfig extension:
http://mozilla.dorando.at/keyconfig.xpi

You must have both extensions for it to work.

Here's some help on it:
http://forums.mozillazine.org/viewtopic.php?f=48&t=72994&st=0&sk=t&sd=a
http://kb.mozillazine.org/Keyconfig_extension:_Thunderbird

If you're like me and just want to delete an email when you press the backspace key, here is the exact code you need:
user_pref("keyconfig.main.xxx_key__key_delete", "][][VK_BACK][goDoCommand('cmd_delete')][");

First close Thunderbird, then add this line of code to your prefs.js file, then open Thunderbird and it should be enabled.

In Linux, your prefs.js file is in the ~/.mozilla-thunderbird/ directory.