Hey, thanks for the welcome and the reply. 
You’re solution works well for the example in the playground. Though, my actual use case would be picking through culled backfaces, by calculating the triangle normal. So the picking point is not enough.
Would a new member scene.pointerPickTrianglePredicate, which is used for ActionManagers and Behaviours, be a good feature request, maybe? I don’t seem to be the only one missing this functionality (How to Configure Scene.pick Predicate for All Picking Events?).