Thanks for making it clear.
I guess that my confusion came from experience with Vue's different approach to lightning computation as in Vue Global Illumination is a different thing than Global Radiosity.
So it seems that in case of Vue it's basically a marketing approach by having two GI types and using this clue word "radiosity" to mark something ultimately powerful and neat.
By talking about colour bleeding in TG and settings required to achieve it - do you mean only those settings in enviro light settings?
I was also doing some experimenting with slightly altering specular reflections colour on leafs with also subtle but positive effect.