You can forward a bar at a time.......how about the same going backwards?
Maybe a dual function return button (with the left of the button depressed it takes you back to the start......with the left part raised it takes you back a bar). Maybe split the fast forward button into two for a forward and back pair.
Looking to the online help for 'return' - its no longer there.
http://www.sagantech.biz/metro/help/Met00266.htm
scoot.