If you are going to use pie for one feature it provides, such as rounded corners, why not edit the source code and make your own build? I personally intend to do this when I am done testing with IE6 as I only need PIE for rounded corners, so I want to trim down the htc file a bit. I haven't tackled this just yet as it isn't a requirement, more of a personal want.
But, I suppose it would be nice if Jason did it for me
so all I would have to do is download PIE_RoundedCorners instead.