Yes, I have those lines in xmodmap. I'm using that Jaunty zubuntu install.
I've even tried to put "F10" at those positions on all the number keys, unsuccessfully.
Finally. I had to map it to the right shift key. But of course I can only access F10. Unfortunately, openMSX on the zaurus is too slow to be usable at the moment.
I guess Xbindkeys has something to do with this problem. But even if I kill it, function keys still don't work.