I recently tested the u3-tool on OpenSuSe 11.2. I was able to enable the security, but not able to unlock the device anymore.
/usr/local/sbin/u3-tool -u /dev/sr1
Error opening device: Read-only file system
So i patched u3_open to open the device in read only mode. I dont know if this breaks anything else, but at least i could unlock my device.
patch to u3_open