Fair enough, but the samples are (supposed to be) based on whatever density you’ve set in lightmass, if the volume actually worked consistently then you could increase the sample density and then use the volumes hierarchically to allocate density where needed to avoid light bleed. while still keeping memory usage within reason.
I don’t know if what you’re suggesting is feasible to implement, personally at this point I would settle for just having any degree of manual control over sample placement.