this package build a menu for different eventually installed window managers.

but only a few KDE applications appear!

what is the way to add (NOT MANUALLY PLS!) the other one or build an analog file for the part KDE to access to the KDE goodies out the other WMs?

All KDE applications should be usable, and thus visible regardless of the window manager in use.
If the XDG Menu files shipped by Debian are not sufficient to allow this to occur, you need to ask their support mechanisms how to correct this.