i did a quick look, (need to assist on homework kids, ).
looks like controlpoints 2.0
it’s more contained in the selection circle. and i can’t see how much sliders for adjusting are available.
But yes i understand your point.
If DxO create a controlpoint which outer circle can be made oval and the feathering can be controlled, (how much it spread outside the circle/oval) then this tool get much more versatile.
Bit the same as the luminance masking showed/discussed in Selective Tone tool working.
sometimes a narrower field of selection is preferred and then luminocity/luminance masking selection by hand is needed.
(As i am just a hobby photographer i think i can without it or work around it.But now i know it’s possible…)
work in progres for DxO staff.