Okay, it is installed. And it is awesome. I'm a bit sad I didn't start using this before. Had similar feeling about command extensions and south when I started using them.
No, I've found that too. My fork on github [0] has the necessary patches to make the "should this be enabled" function make its decision on the basis of a GET parameter, so you can do ?toolbar-enabled=1 and ?toolbar-enabled=0 or whatever.
