I frequently have multiple EMP tabs open and am in the middle of projects when I need to leave for meetings, etc., and return to find that I've been logged out of all of them. As I have a locked office and private computer, I'd like to disable that so I can efficiently return to my work.
Another reason this is important is that I might have multiple sessions open for our separate instances, and logging back in switches me to our primary instance which causes more difficulty getting back to where I was in the other instance.