Position Icon "Edge" Location option...
Currently within the Beta 16053 there are only 3 options in the "Location" drop down; Surface, Pivot, Volume of the "Position Icon" operator. I would love to see the classic "Edge" option. I understand if the creator(s) is trying to make something different than the stock PFlow. It's a cool endeavor and ambitious. I appreciate it though.
Well, I agree, but you can use tiny torus anyway, in position object. 

Anyway, what I think is more missing, is a position by poly center (not face center), on a position object modifier.

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