I have decided to remove it, because a left click toggle button was not working (well). Since we currently do not use it nor have request for a fix, it was the easiest way to remove it. Do you think it worth to spend some time and reintroduce the left toggler?  If you have a valid use case for it as test scenario. I can try to fix it.   
.. or should we just move the "is obsolete" warning, and fix it on demand?