I like the external editors window but it takes up so much space. I think the following changes or options would improve it.
1) Enable a single click option to open your editor instead of only double clicking
2) Remove the file name and window borders
3) Remove the editor name
4) Have an option to use small or large icons for the editors
Basically, it would be be a simple icon based window to launch the editors. Without all of the extra text, the window would be very tiny and could be left open most of the time without being too distracting.