Material Thickness Setting

So I recently added a Z table to my laser and everything seems setup correctly and working but the way it works in my setup is that it homes up to the top of the bed, not material, and sets that to 0 meaning I need to add a negative material value but the GUI doesn’t seem to let me.

Is there any way to either set this value as negative, or flip the z coordinate system in Lightburn so down is positive (which would be more ideal)?

Edit: Or any Marlin experts out there running a BTT SKR V1.4 with TMC2209 drivers have this solved? I’m getting better at figuring out Marlin but I’m also like 5mins away from just writing my own controller firmware and maybe even doing it in an FPGA xD

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