How to set right-click for Reverse Shade in Shading Ink?

Hello,

When using Shading Ink, I would like to change the behavior of the right-click.

Instead of drawing with the shadow/highlight color, I’d like it to perform Reverse Shade (Switch Color).

I couldn’t find any option for this in the preferences.

Is there a way to configure it?

Version: v1.3.15.2-x64 (Steam)

Thank you in advance for your help!