I have a dual head setup and I'm running gnome-shell from jhbuild.  The hot corner used to bring up the notification bar is on the bottom right of the first monitor.  Unfortunately, it requires some dexterity in order to bring up the bookmarks due to the fact that I have a second monitor.

I'm not sure what is the optimal solution here.  If you used the left hand side, that would work for some users or on the other side or you'll need to rethink how the notification bar is activated.  The older iterations had the notification bar come up automatically when the pointer hit the bottom of the window.

sri