I used Rev. Herring about two years ago, and I was thrilled. Of course, DH and I just wanted something simple, generally religious, and pseudo-Catholic. He helped us pick some readings for our relatives to do, and did a beautiful ceremony with a bit I really liked pertaining to partnership in marriage.
I'm Filipino and wanted to include some of the traditional wedding aspects of my culture into it. DH is protestant and wanted a unity candle. Rev. Herring managed to put it all together flawlessly for us, and our ceremony took only about 30-35 minutes tops. I had a low blood sugar problem at the time and we asked him to do things as quickly as humanly possible while keeping all our elements (so we wouldn't risk my fainting), and he delivered! A lesser mortal would have had us there at least another ten minutes, I'm sure.
As for a totally custom VR, I don't know. But if you want a bit of coaching, someone with a good sense of humor, and some unique cultural elements, he's your man.