I also noticed that doubling the coordinates sometimes works, but not always. It seems impossible with flying arrows and fireballs. I haven't even seen the developers do that (or maybe I just don't remember). As for the wall, I'm curious myself: it might be useful when I decide to finish the campaign someday. But for now, the work has stalled. The most interesting thing is that I found it easier to create videos than maps. Although, I think it depends on the person.

Added after 40 seconds
And movepoints are for moving heroes and units, not for animations.