My problem is Favorite button in questions. I want to use it as Favorite to book good questions or questions with good answers that I can later reference. But at the moment I more often using Favorite button simply to be notified about progress of solving question which I answered. It would be nice to separate booking and notification subscribtion.
You can use it for either of these things, but not both.
Notice on your user page under the preferences tab there is a checkbox:
If you have this checked, you have bookmarks. If you leave it unchecked, the default, you have tracking of arbitrary questions.
I recommend using your browser's bookmarking facility for plain vanilla bookmarking -- Google Chrome has an excellent shared state bookmarking tool (through GMail accounts) built in, for example.