LOWPASSFILTER-CALC: Webench Filter Design - Inverting Filter

I am trying to design a single-stage 2nd-order active LowPass filter. In the past I used TI Filter Pro, but it looks like that has been discontinued. I found Webench Filter Design on the TI site, but I can only find non-inverting topologies. Additionally I can't seem to figure out how to change the RC values.

1. Is there a way to specify inverting topology? The tool won't let me use a negative gain.

2. Is there a way to modify the RC values around the cutoff frequency?