Then you don't want a "Home" button on your computer, you want a "home" type button in FCP. Look in FCP help or user manual regarding how to navigate in FCP. I don't use FCP so I can't be more specific.
Have you tried using the "left-arrow" key while holding down the "fn" key? That functions as the "home" ("top") key in most applications. Similarly, fn+right=end/bottom, fn+up=pageup, and fn+down=pagedown.