after some job I issued a new version with the following changelog:

added one more panel icon size value to choose in preferences
add layout dialog: headers clickable for sorting
bugfix: using show layout as text and dark panel
bugfix: detection of current keyboard layout at first run
support for "per window layout" as in former plugin keyboard layout switcher
application launch bar plugin improvement: in config dialog doble click on lists items causes buttons remove/add clicks

source code and debian/ubuntu packages here http://www.giuspen.com/customs/#downl