„IMPORTANT
Icon
When an emitter is excluded and does no affect a certain object, what is excluded is the direct contribution from that emitter, but its indirect illumination as it bounces off other surfaces will still affect the object, as once bounced it cannot be attributed to any particular source.“
Well, to be honest, I wished severeal times mureley, material should have the option to increase number of bounces, or change their count depending on counts (of course there should be a safety feauture to kill beams or certain types, or set all to default after a time limit)).
I can imagine these additional material features is easy to use, quite helpful for complex scenes and feasible with reasonable effort. Its not really a tweak its just changing probability of beams next step.