portal checkbox and strength slider in the principled bsdf

Would be great if there was a portal checkbox on the principled BSDF to remove the need to create and scale many light portals outside of windows. For example if you have many windows using the same glass material, you'd just tick the option, and all windows would act as portals immediately. No messing about.

There should also be a portal strength slider to amplify the optimised light generated by the portal material too, so that you don't need to keep modifying the environment strength for inside vs outside cameras.