There is, you'll have to go in and edit the layout script directly though.
If you open up the layout.nut file for the orbit layout, around line 150 is the following:
local snap = fe.add_artwork( "snap", 224, 59, 352, 264 );
snap.trigger = Transition.EndNavigation;
local frame = fe.add_image( "frame.png", 216, 51, 368, 278 );
Anywhere after this you just need to add the following line to the file:
snap.preserve_aspect_ratio=true;
hope that helps