hi,
i've also a lot of problem with the default boot partition, even if i made this changes in the Extra folder:
For default boot partition add this to com.apple.Boot.plist
<key>Default Partition</key>
<string>hd(0,3)</string>
I still get the default partition as the boot flagged partition, in my case (hd0,1) nfts windows vista. Does anyone knows why the changes don't apply? I've copy the com.apple.Boot.list to the desktop to be able to write in and then deleted the old one in the Extra folder, and drag in the modified com.apple.Boot.list, repair permissions, and nothing changes.
Any ideas?