I second this as a shortcut on the F3 screen.
F9 screen usually has quite some delays. Of course, when searching for habitable planets you'd switch to the F9 screen anyway to get a system summary, but no reason not to have a F3 map shortcut.
I would also like to see that when you press F9 when the map is open the System Information screen will open at the system you currently have open on F3.