To my knowlege that functionality does not exist. In other daws is named Markers, and you can quikly access them with keys 1,2,3,4...
At this moment in Reason you can only have 3 markers and advance to 0.
So, 0, Left Marker (1), right Marker (2) and i don't remember how you go to the end marker.
Other thing that annoys me is the fact that you do not have punch in and punch out for loop markers. As a performer recording alone this is a quite handy functionality.