Force target="_blank" and rel-"nofollow"

Back in WordPress 2.X, I was able to edit line 369 of the quicktags.js file to read as follows:

edButtons[i].tagStart = '<a href="' + URL + '" target="_blank" rel="nofollow">';

This allowed me to automatically, by default, include target=”_blank” and rel=”nofollow” in all my links.

Unfortunatly I can’t seem to replicate this fix in WP 3.3. I edited line 572 of the dev file to this:

t.tagStart = '<a href="' + URL + '" target="_blank" rel="nofollow">';

But that didn’t produce the desired result.