When I was creating the First working version of TeamMentor Mobile I gave scripted a test drive and I quite like it.
You can read more at Scripted: A Javascript Editor from vmware and this is what my GUI looked like:
Since the scripted stuff on the bin folder wasn't working (on Windows), to start scripted, I added the node.exe file to the server directory and launched scripted from there using node scripted.js
I really like the real-time feedback on JS Errors and it is nice to code on an IDE that understands Javascript.
What I really want to learn more is the use of Annotated JavaScript for the Closure Compiler (see https://developers.google.com/closure/compiler/docs/js-for-compiler) since this could be a great way to add type information to Javascript. Note how in the TM_Mobile.js file (screenshot above), it starts with /* global ... */ which tells the compiler to accept those variables as globals
One feature that I would like to see was an auto-preview of the code changes (in a browser window)