Yes, I like doubling for 576 to 1080p.
To activate doubling simply pick a doubling algorithm. These include super-xbr, NGU, and NNEDI3.
The options you quoted allow you to adjust what scaling factors a doubling algorithm will activate for, if the scaling factor is below that ratio madVR will use the option selected in "if any (more) scaling needs to be done:".
Let madVR decide uses 1.2x for the ratio so by default doubling will activate for 576 to 1080p.
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