Not sure if everyone will think this is "Major".
Re Navbar/breadcrumbs.
There is a new tracker item here: https://tracker.moodle.org/browse/MDL-39142 and some recent discussion here: https://tracker.moodle.org/browse/MDL-37762
I thought I knew my opinion on this, but now I am not so sure. I had missed the comment "Different for admins and students".
There is no hurry for this I guess. Code freeze day for Moodle 2.6 maybe?
-Derek