I remapped my german keyboard ( editing /usr/share/X11/xkb/symbols/nokia_vndr/rx-51 http://wiki.maemo.org/Remapping_keyboard ) and then used Keyboard Mod to put the missing signs (*+#$=) on the virtual keyboard.
So now I've instead of this signs àéèçù^ on the physical keyboard!
I could post my /usr/share/X11/xkb/symbols/nokia_vndr/rx-51 file if you're interested...