Sorry, no not at all. As you normally want this feature active in all runmodes (author and publish) this shouldn't be in a runmode specific folder in my opinion. Even if it was, I stated that it works and doesn't work with 2 urls patterns on AUTHOR.
I think I fixed it though. In our project we had another rewriter configuration active next to the 'versioned-clientlibs' node. It had a 'Paths' property value of '/content/...' in it. So I figured, what if that one is overwriting the result of my versioned-clientlibs? If you add the '/editor.html' I assume this no longer matches that path and that second one isn't applied?
The second on had order '10', while my versioned-clientlib config had order '1'. So I figured to see what happens if I reverse the order, so I set the order value on versioned-clientlibs to '11' and making sure it was of type {Long}. And voila, problem disappeared!
So please guys look at http://localhost:4502/system/console/status-slingrewriter and check the order value of your config.
I assume similar rewriters for the [text/html] content type have Paths, Selectors or Resource Types defined so they don't conflict with your config. If you find one with a similar setup, just try to give the 'versioned-clientlibs' a higher order value to see it is applied last.
Hope it works for you guys too! Cheers!