Sorry for the delay. I've had several unexpected time-sinks thrown at me these last few months.
In that time, I've received a version that is built in pure JS using prototypes. I'm currently looking at the two to determine what's best. We added the PureMVC faux-class style so to make it easier on devs, but I'm not yet sure we want to build the utilities based on it.
Please have a look at the most recent posts in this forum from Saad, who has put the Prototype version forward. Perhaps we can discuss the pros and cons in these threads and you could have a look at his code and give your thoughts on which is the better way to go. My primary expertise is in Flex/AS3 so, I want to be sure to get the best input from JS devs on the JS port/utilities before making command decisions.