i haven't attempted to connect an IPOD specifically but in any case of mounting disk devices,
whenever i asked 'how do i tweak visudo to allow users mount/umount devices", they redirect me to tweak fstab instead of the sudoers file; the reason being that it is safer to allow accesibility to a device rather than a command.
read this post, if you like:
basically if you add an fstab entry for the IPOD device, you can add the feature 'user' which allows any user of the computer mount and unmount a specific device. fe:
/dev/cdrom /mnt/cdrom auto noauto,owner,user,ro 0 0
other than that, im curious (cause i have an ipod shuffle), how do you upload/download music to the ipod.. i thought this could only be achieved through iTunes.