Hate to be negative but...I'm pretty sure you can't. Pinnacle Studio uses a very basic text editor, the same one used by Lego Moviemaker Set...but I used an older version of Pinacle Studio, so I may be wrong.
The closest you could come with that would probably be to have each individual title scroll up on to the screen, stop, and than scroll up to the top (using transitions).
I'm pretty sure you can't. I have version 7 and you can't. Best thing for you to do is export it into Movie Maker and use that for rolling text... I'm pretty sure it has it
It's there (90% sure), go through the title options, and rolling credits will be there, the thing is, when you type, it just seems like a big text box, but after you render and play it will roll up the screen.
Losing consciousness,
in the arms of an angel,
I find only peace.