Oh, I'm sure someone out there will love me for this. Download this addon and you can make a macro that will update every time you change talents in that tier, so you can use one button for DB, Fervor, TotH and you don't have to drag it onto your bars each time, and for passive talents you will have the spell icon instead of an empty button. For some reason the wow macro system sucks at handling #showtooltip with multiple spells.
http://www.wowinterface.com/download...ntMacroes.html
(read the instructions)
I wanted to punch myself in the face when I realised there was an addon to do this. I hated having empty buttons and too many instances of "d'oh I forgot to drag barrage/crows onto my bar".