Sharp corners in curve?!

 From:  Lemo (LEMONNADO)
Here is a link to the screenshot I made this morning. It shows the slashes I made with RHino4 to coax the machinery into producing an acceptable surface. I love the idea of colors and the ability to double click and switch from corner to tangent point. But I must say that after working with it for 5 minutes the current way to handle it becomes second nature. However, a smarter algorithm to sweep between two rails would be fantastic. I can see that this is a rather difficult endeavor as it requires a lot of intelligence in the algorithm.