nope, it's strictly a "polygon" plugin. as in
a polygon (pron.: /'p?l?g?n/) is a flat shape consisting of straight lines that are joined to form a closed chain or circuit
If one day I feel good enough in js and if I find a good way to interface it in ACE, and if I find a good way to generate corresponding collision polygon, I might decide to make a "Shape" plugin.
But as you can see, there's many "ifs" (:
And if you don't need collision polygons, I suggest you look at the canvas plugin from R0J0hound
On another subject, I just updated the polygon plugin, I had left some bugs in the boundingbox calculations.