I got the same symptom, my C3K cannot suspend by select from the Q menu..
I also tried to create a script and put it into /home/QtPalmtop/bin/, and edit the /home/QtPalmtop/apps/__9quit.desktop file, changed the "Exec=" line point to my script, unfortunately, it still didn't work.
but I can use the "apm -s" command to suspend without any problems.