I should add that, in my brief searching, to learn more about my own question, I stumbled on this. It seems much akin to the very cool rEFInd bootloader:
I'm looking forward to running ZBM through it's paces when I get some time.
I actually found out about it from a Reddit comment by Jim Salter a.k.a. Mercenary Syadmin, a huge ZFS advocate.
Only had to use it once to boot to an older snapshot, but it was so much nicer than the grub console.
Do have to make sure you don't let it get too old and upgrade your zpool features that it doesn't support, but that's always true with ZFS boot.