Finding the right modifier ID in a japanese keyboard layout

[xorg at henrik.synth.no]

xorg at henrik.synth.no skrev:
> This works, but as I understand, xmodmap is out of style.  As I 
> understand, I should do something in XkbOptions in xorg.conf, or make my 
> own symbols definition in /etc/X11/xkb/symbols/
> 
> The problem is, what symbol is the key just right of the space bar?  The 
> alfanumerical keys are easy to name (AE01 etc), but this one (and the 
> other japanese modifier keys) is considered special.

Is there any tool (like xev) that prints the /etc/X11/xkb/symbols/* key 
identifiers as they are pressed?

And does anything like a graphical keyboard layout editor/creator exist 
for Linux?  I've searched around, but cannot find any.

Henrik