You mean like this…
Note: That’s a single viewport showing all of the “layers” used to produce this image…
So don’t assume too little 
The FLR shaders do quite a bit, however, most of it is not exposed in the UI [yet] (on purpose)… We did not want to inundate users with complicated UI, confusing settings, and just an overall frustrating experience right out of the gate… So we’ve come up with simple (but effective) examples that demonstrate specific types of styles/effects, and provide minimal control over them.
The amount of “control” will most likely change/evolve over time…we’ll see.
-J