combine Main Bar and Format Bar?

I was wondering if there is a way to combine Main Bar and Format Bar? Or perhaps a way to put buttons from Format Bar to the Main Bar? I have way too much empty space in my Main Bar and Format Bar just wastes my screen estate. I would love to combine these two to save space if that’s possible. I even tried to examine the registry and prefs file but even a small change on the toolbar makes many consequences there so I don’t think I might be able to figure out how to put Format Bar buttons onto the Main Bar this way.