Find it quite usefull (at least x-dof, coz finalDof producing strange results in VRay) and really fast 
For ex. u can tweak at almost realtime speed your DOF settings.
I’m just curious - why everything, that cebas done already (finalDof / PyrocCluster - all that effects stuff except finalFlares) behaves in a strange manner in VRay ?! PyroCluster doesn’t render correctly at all, finalDof - produces glitches on objects edges… Anybody ?
You just need to find the line of code that says "(if renderers.current = vray()…then crash) 