To add the description of the shortcut in the menu "File"
close the browser and look for another file "accel.cfg"
which you will find in then subfolder /defaults/settings .
Open this file in Notepad as before and at the bottom of
the file add the line :
CTRL T = ID_NEW_TAB
as before in the other file "accel.cfg"
and save the file in Notepad in the
menu "File" with "Save".
Don't use "Save as" because this would again
add the ending .txt to the file automatically,
and the file would not work anymore.
After a Browser restart, the description of the shortcut
should be present in the menu "File",
By the way for new readers of this older thread :
The variation updated to the latest Gecko is called
K-Meleon-SM2pre, and can be downloaded here :
http://two.xthost.info/eichhein4/K-Meleon-SM2pre.zip
Regards
Fred