I have 2 monitor's, and I would LOVE to be able to open up the map and drag it off to the second monitor while leaving my game screen alone. I think this would be very useful for players.
While I am sure that would be nice, I am pretty doubtful that SE is going to spend time programing something that is useful to a mere handful of people. There are far greater things they could spend their time doing that would actually be useful to the majority of players.