Hi James, it sounds like just too much special cased behavior to be put in a general purpose command like Flow, especially the part about the size of the objects to be flowed to implicitly select a second surface. There's just no consistency with that type of implicit selection happening in any other existing workflow in MoI currently. And then having it be a special case that only applies to all plane surfaces is another consistency problem.

But it could be possible to add some functionality for doing that elsewhere though that a script could access.

- Michael