Hi,
The scroller script is quite heavy like it is right now - sorry - right now you would have to change this by yourself - but belive me - it's not trivial -
the file cmotiongallery.inc.php creates the dhtml strip + the Javascript for the movement itself.
I haven't tried to change the orientation of the strip yet.
you would have to define a new viewport and then add the pictures in the right orientation! And then you would have to change the cmotion javascript (which sould not be that hard

.)
/Michael