I found the option on my VZW 8330 by hitting the green call button. Then I pressed the blackberry menu key. Click options/general options/6th option down is "dial from home screen". Highlight it,click it and you get your choice of yes or no.
I have to give thanks too. Had to do a google search and the title of this thread fit it exactly. Unfortunately the search function on the forums itself isn't that great.