Clone a selector

I'd like to be able to copy (= clone) a selector. Sometimes I have a selector with complicated CSS and/or regex, and I have other very similar ones. It would be faster if I could just make clones of the first one and tweak them a bit.

As it stands my process is: edit the 1st selector, highlight and copy the CSS, close the 1st selector, create a new selector, name it, select its parent (see my earlier bug report), paste in the CSS, tweak that, save the 2nd selector, re-edit the 1st selector, highlight and copy the regex, close the 1st selector, edit the 2nd selector, paste in the regex, save the 2nd selector. That's not exactly hard, but it's tedious and error-prone and I have to do it ~100 times.