replace material of subobject , of multisubobject material

Dear Vantage team
Very often objects , especially 3d trees have multisubobject materials. In archviz it is always a challenge to match your architecture color scheme , with the lighting of your scene and then you need greenery , specially trees and grass to match nicely (some times to be brighter but if you bright up the scene your white architecture gets burnt)....
It would be very convenient if we could just replace the leaves material of a tree. Especially now that chaos cosmos comes with nice leaves materilas, it would be nice if you give us the possibility to drag and drop a material on an object and only replace the subobject material, in this case the leaves.
can you please figure out the easiest way to implement such a possibility. If it is hard to code selecting subobects of an object maybe you could make it to drag and drop one material on the material tab on top of another and get a dialogue if you want to replace that material.
It is already super cool that when you import a multisubbject vrscene in vantage , vantage creates in the materila tab both the multisubobject and the subobjects themselves. So it could be nice if we can drag drop one material on top of another and get asked if we want to replace them, and this change should affect objects in the scene.
Maybe you will have a better and easier to apply way.
Thank you very much in advanceTags: None