The theory at the time was that since Mandriva was making its own usb key, complete with O/S, and selling it, they made it hard to make it USB bootable. I remember some workarounds for it.
I also remember I had to do a few things to get it working on Fedora at the time, link /lib/udev/vol_id to /usr/bin and linking libaudio.so.0 to libaudio.so.2
However, I agree, it's a very nice tool. The advantage of the livecd-iso-to-disk is that it doesn't require a GUI.
Do NOT PM forum members with requests for technical support. Ask your questions on the forum.
"I don't know why there is the constant push to break any semblance of compatibility" --anon