Gilrock,
I'm looking at the Picture effect currently as I was trying to do something similar with stopping an image before it scrolled away.
Using version 2016:22, there does seem to be options to start a picture with an offest "Start Position" and end a picture location "End Position" but the End Position tab is not available for use. Interestingly, the "start" and "end" scale options are available.
Was the "End Position" mistakenly left out?
Thanks