by Eric Strom.
Very helpful tip, Davo!
We were able to modify mod/assign/renderer.php to add an alternate grade button to provide the option for instructors to navigate to the old interface without having to manually change the URL (at least on the Assignment module page).
It looks like this:
https://moodle.org/mod/forum/discuss.php?d=339686
Still working on the "View all submissions" page.