Full CG??
I do have a scrolling credits screen that you can use..
yes there is, edit the gallery.rpy file
in it there are two --> grid maxnumx maxnumy: <-- the first is for the images, the second is for the text adjust the --> yalign 0.1 <-- (IN THE SECOND one only) to a larger number to move it down 0.5 will be in the middle of the image and 1.0 would be the bottom