Interesting. But in the end, I think it’s just another physics engine added to the list, whether it wraps existing ones or not.
but the idea is we only add one… they add the rest 
adrianboeing.com/pal/index.html
there are many things like it; in my experience they are not quite as uniform as they would like you to believe on account of different abilities and features of the various engines. Basic physics work well, but anything more complex is annoying to make work with any engine through these wrappers.