MF 108 output configuration

The MF108 has internal dipswitches allowing to change output configuration.
Thing is, i want a setup that is not directly explained in the manual:

i would like all settings to be the same as default, but no dry signal, since i’m using a send-return setup.
So, right channel inverted phase wet, left wet.

Is this possible? I know i can just turn the mix dial, but maybe there’s a bit of bleed or less noise?
And it’s convenient if you would accidentally turn the mix dial in a hurry.

Also, there’s some kind of firmware update on the moog downloads page. anyone know what it does, and how i can tell if it isn’t allready done on my pedal?