Here's the SSS material I'm overriding

Here's where I am thus far:

The partition has a material override and I plugged the incidence into the surface. My question is: How do I disable the lightmap it's writing? I'f im doing a quick/simple incidence pass I don't want it spitting out lightmaps while it does it. Typically I've just duplicated the shader/got rid of the lightmapwrite/threw it on the object's partition but I was wondering if there was a way to do it with override since it would save tons of time for me rather than duplicating and tweaking individual shaders for each object.