Thanks, JohnHell. I knew it had to do with the toolbars.cfg file, but wasn't really sure where that file was. I copied the setting and the BMP file from the KM-16-F3628 skins folder on another drive, and now the toolbar button is in place.
Isn't K-Meleon just wonderful, in the way you can change its appearance and configuration simply by adding some script to an already existing config file? It's a great pity, if true, that development has been halted on this fine browser.
Windows XP Pro SP3 | K-Meleon 1.6.0 Beta2
Trying out various subspecies of the lizard