Hello Joerg, are you sure that the ALT (Option) key is correctly recognised by wmii? Using wmiir read /event and xev verify that the ALT (Option) key works with wmii.
I had to place the attached .Xmodmap in /usr/X11/lib/X11/xinit/.Xmodmap in order to get things running smoothly. Since I am no export on xmodmap feel free to suggest improvements. Please note that for the various bugs that still remain in OS X's X11 (e.g. missing fullscreen support) I installed 2.1.1 of Xquartz available at http://trac.macosforge.org/projects/xquartz which might also make a difference. Cheers, Alexis
Xmodmap
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