beadm "unmount" action should have an alias "umount"
For good or bad, all or most other commands which unmount filesystems are called "umount". Because of this, command-line work with "beadm uNmount" causes typos (wrong parameter) quite often.
I propose that an alias "umount=unmount" is added to beadm program (but maybe not pushed forward in "beadm --help" to maintain compatibility with other versions of beadm i.e. for script-writers).