From what I recall, the "All: *" entry is used to indicate that any executables not listed in exec_attr will be run as if RBAC wasn't in use at all - of course user has to have proper system rights...
OBP uses the term "disk" for any type of disk. The kernel uses "sd" for the name of a SCSI disk. Other types of disks have kernel names starting with "cmdk", "dsd", "ata", etc.