This is one of those things you don't even realize you miss that much when moving from a full desktop application to a web app until someone points it out. That happened to me a few months back and I've been suggesting the feature to gmail ever since. I was very happy when I came across the script. It didn't work at first but the author was very responsive and with enough feedback, fixed it within hours.

Any chance of adopting this script to add the button to google docs apps? The feature is there, but a button to use it would be awesome.

Anyway, great script and great author. Thank you.