window snapping padding

This is super nitpicky but is it possible to have BTT pad windows ONLY between each other, and not the edges of the screen or dock? This is to say, if I have 4 open windows snapped to all 4 corners, I would like to preserve a 5px gutter between all 4 windows, but no gutter at the top, sides, or bottom of my screen. If not........ feature request?

im pretty sure there is an internet app for that, though I forgot the name of it....

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