Hi Andrey,
I did not recognize your english as being bad until you wrote that it is :)
The documentation needs to have information about the debug-mode-on
and -off functions as well as the *max-debugging-threads* variable.
You don't need to write a novel, just a description of what they do
and how they're meant to be used. You should also mention that the
special behavior is useful together with Slime. I'm going to review
what you send and try to iron out any language issues that I find
before committing.
-Hans