Roto-beziers on Focus Effect Editor

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.
 

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