RCRN is made up of two complimentary parts - an ESP similar to Realistic Lighting, and the post processor. So even if the shaders aren't installed, you would still see some of the effects.
Can I just get this one straight in my head ;)
So... the post processor for RCRN is the equivalent of TC's iCCC for RL yes?
Not sure if this helps but I recall reading a method for renaming one of D3D9.dll allowing 2 to work together - can't remember the details atm but it relied on using a [Proxy] entry in a script.
I tried to get info on using this method to introduce injectSMAA with iCCC but never did get any replies :P
Don't know if any of that helps or is just blather, ho hum :)
It sounds like blather but it is interesting blather, nonetheless.