I would generally second an approach like the one in snowdrop, but fact is that it is already implemented more or less.
And yes, i’m speaking about indirect contribution from spericalcaptures. You need to enable it from a console variable that sounded like “r.diffusefromcaptures=1” but i don’t really remember how. Search the forum.
Problem with that feature is workflow, which is absolutely not ready for production.
It lacks the way to update on request (bp, i think you could do that in code) and it’s not optimized (meaning update has to be decided manually using some conservative algo, lacks automatic placement)
And it’s tied to reflections so you cannot really specify different contibution values.
So for me the actual feature request would become “DIFFUSE SPHERICAL CAPTURES WORKFLOW IMPROVEMENTS” or something like that.
That’s the only way we’ll see something like you are proposing, as implementig a new system on top of everything is wasteful now (remember that a lot of resources are being spent to get HFGI and DFGI working right now).
Just my 2c.