I'm no expert, so I hope the blokes and frydogs and Insomniacs of the world dont think I am getting uppity when I answer. However, I have always read that 1 gallon to 5 gallons is the same amount of yeast.
You are more likely to have a threesome with members of the Japanese women's curling team whilst spinning a plate on your head than you are likely to screw up a batch of JAOM.
YES, WE HAVE TRIED OTHER YEASTS! USE BREAD YEAST FOR JAOM!