We're kind of used to pressing ALT and Left Arrow Key to go "BACK". It might not be a very important feature but it used to exist in the former versions. Doesn't work here.
This might fall under bug 22529 which is a catch all bug for non-working keyboard shortcuts...
Changing component to XPApps. Sorry for the spam.
Yes 22529 covers all shortcut issues and curret status. *** This bug has been marked as a duplicate of 22529 ***
Marking Verified as a dup.