M-unit rear light and brake light

I`m planning the wiring harness for by bike using M-unit and its looks like it standard deliver 50% of the voltage when not braking and 100% when breaking, so the idea is to use the same light for brake and rear light.
On my bike I have two different light for light and braking... I think I have seen back in time that somebody was using the aux output or something?

Somebody know my options there ?

Thank you !