Yep, just hold your hand so that it catches the ruffling dough as it comes out of the machine. In sewing, you can create a ruffled effect by not allowing the material to freely exit the needle area. The feed dogs keep feeding but the material begins to bunch and ruffle as it comes out because you are not allowing it to "relax". You might need to periodically push the bottom edge of the ruffling piece in a bit so that is is tighter ruffle than the top edge
I was thinking that maybe the same principle as in sewing could be used here....just prevent the fondant from relaxing into the straight sheets as it feeds through the machine...

It might be worth a try at least.