This tool exposes the main VRay settings that contribute to the quality of the final rendered image and puts them into one quickly accessible dialog.
I recomend using this in combination with the VRaySampleRate render element to fine tune your renders for speed and quality.
To install just drag the download .MZP file into the 3dsmax interface. You should get an Install dialog.
This tool will install a macroscript that can be accessed from the Customize User Interface dialog within 3dsmax.