3. 6D has ALL I mode, use it.
Am I mistaken in thinking that All-I on the 6D was shown to have very little advantage other than bloated file size?
I had read the wonders of All-I when I first bought my camera, but somewhere along the line I came to understand IPB was actually the more sensible choice for it's overall cost/performance ratio. Maybe I was misinformed somewhere along the way...
Would love to be corrected if someone had a strong case for All-I on the 6D that I haven't heard.
p.s.
The disappearing menu is a common bug, i't there to stay and we LOVE it! 
Okay, I may be taking crazy pills, but there was a build right before A1ex took his break from ML dev (maybe in Sept?)
and I SWEAR that the menu was persistent, no longer disappearing after a few seconds. However, it is indeed back to it's usual self on my 6D after updating from the circa fall 2014 build to a January 2015 build. Am I going crazy? Do I need to try to find this old build and test for sanity, or did someone else experience this?

Cheers!
-Daniel