Lol kind of surprised to find out this is not normal, since that's how it is in Max - the Slate editor is just another way of editing the same materials as the Compact editor, and is a "world view" of whatever you show in it.
BTW, for grouping things in the Corona Node editor, one option is to create separate views. Again, they aren't separate nodes or materials, just a blank canvas into which to drop whatever you are working on at the time. Not sure if that does the same thing you were thinking of, for wrapping up a group of materials into one node, or if you had something else in mind?
well yes, what is normal? :) :) it was just that all other node editors in c4d renderers i know work per material. but your concept is welcome ofc, it offers cool possibilities!
what i mean by grouping is what you can do in xpresso as well (and also in the new c4d nodes):
group a setup of multiple nodes into a "master" node (with input/output slots) see the new uber material for r20, for example.
this could also be used to display one material as one node, which would maybe let u keep a bit more order
(i imagine 50 materials all with input multiple node chains... grouping would allow to keep things in order)
i didnt get what "create separate views" means, yet
... must play more :)