Actually you just solved it :P
Ok for these purposes -
1st - Install OSX on the guest drive, create non-admin account as default and remove USB storage devices / network kexts
2nd - Swap the existing
primary and guest drives physically so the "guest" install boots first (idiot proofiing)
3rd - specify in the Guest install your itunes folder on the primary drive.
Press Alt during boot do get into your "real" install, any changes to traktor / itunes there
should be ported straight across to the guest install (you might have to copy the library xml manually though to the guest home folder)
For this to work you also need to remove the recovery partitions.
Heres the problem though, they could still plug a hard disk containing osx into the usb pre-boot and run their own copy of osx from there to access the files.
*edit* this should work to prevent booting via external disks
http://support.apple.com/kb/HT1352?v...S&locale=en_US
Oh and I'd set up your second drive (with the admin install) with an OS and Music partition separate for backup purposes.
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