Close all open Retime Controls\Retime Curve lanes

Sometimes I forget to close retime controls and I have to scroll the timeline back to find all clips with open retime controls and close it one by one.

It would be useful to have the ability to double click on empty lane space to close all open retime controls etc...

I know this is quite old, but I had the same question. I opened a different timeline and then went back to the old one and that closed all the retime control lanes. I'm guessing if you close/open the program again that would achieve the same result.