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I've made a plugin for this:

Duplicate of Please vote there instead.

Looked this up a bit, and it seems there's no way to set environment variables on the user level any more in OS X Mountain Lion. See this for more info:

This happens on OSX as well.

That's also what I first tried, right clicking the tab. Later figured out I had to right click the text area but it did not feel as intuitive.
+1, would go great with Vintage mode.
Another alternative would be to put in the trash.
+1 Would be useful for writing blog posts etc.