Keybinding Mouse Buttons

[Vort]

Is there any way to bind my mouse thumb buttons to various things? I tried it the normal way and clicking it has no effect, just stays as "Press a key". I was looking in the eqclient.ini and found where the keymapping is saved but instead of being named, the key combinations all correspond with a number, and I don't know what number the thumb buttons would be.

Any help would be appreciated, even if just to say "not supported/possible". Thanks!