All of us make music in different ways. Some times you'll be working on a part, that you want to loop to get everything just right - but also step away from the work area to grab a cup of coffee, etc. It would be a nice and cool feature, to right click on the loop button in transport and say "For now just loop between Start and End markers", so I can listen to the whole song, while stepping away. When I come back, I still have my loop selection set for whichever part I was working on. And could go back to looping in the loop selection.
Basically what you have in the various bounce options; Bounce in the loop, or between Start and End markers.
To my workflow, that would be tremendously helpful - I hope other SO users will agree! :)