[compiz] compiz without a desktop window

[moppsy at comcast.net]

Running compiz without a desktop window has some unexpected behavior.

It is not possible to grab the cube with the mouse.  The pointer needs to be over a window for it to work.
In display.c the XSelectInput call in addDisplay is missing ButtonPressMask and ButtonReleaseMask, so it makes sense why this doesn't work. 
Is there a reason why they have been left out?

Lower window with Button2 on the title bar doesn't work at all.
Using the binding for lower window does lower the window, though not always to the bottom.
There are occasions where it does lower it to the bottom, but it's not clear what causes this.

I start Xgl/compiz like this:

xinit /etc/X11/xinit/xinitrc.compiz -- /usr/bin/Xgl -ac -accel xv:fbo -accel glx:pbuffer -ac -br -deferglyphs 16

where x/etc/X11/xinit/initrc.compiz contains:
gnome-window-decorator &
compiz gconf

This is on a pure vanilla fdo cvs build.

Obviously, using a desktop window removes this behavior.  
That is something I'd prefer not to be forced to do.