Hey, I've been exploring the focus effect editor. I love the little grid and the ability to make focus effects with it.
However, I don't have the most precise of hands when drawing a path with the touchscreen, or even the mouse for that matter.
One feature I would love to see is the ability to make paths using roto-beziers (like the ones made with the pen tool in Photoshop). This would give many people the ability to make perfect curves when drawing focus paths.
I can't see why it wouldn't work.