Some of my RWG POIs are attracting screamers due to heat generated by pregen light sources, so I came here looking for a workaround. Would this work better than what you are currently using for blocks.xml?
Code:
<blocks>
<set xpath="/blocks/block[@name='wallTorchLightPlayer']/property[@name='HeatMapStrength']/@value">0.0</set>
<set xpath="/blocks/block[@name='candleWallLightPlayer']/property[@name='HeatMapStrength']/@value">0.0</set>
<set xpath="/blocks/block[@name='burningBarrelPlayer']/property[@name='HeatMapStrength']/@value">0.0</set>
</blocks>