1 - Sorry, there are no plans to include support for NURBS modelling in this library. I recommend using other libraries like
2 - The MeshBuilder contains support for revolve, extrude and simple loft operations. Better test coverage is planned here. There are some simple/experimental polygon algorithms implemented (subdivision, chamfer).
3 - Sorry, there no plans for sculpt modelling at this time.
See the "road map" on the home page for information on where I would like to see the library moving. I would also like to improve documentation and test coverage before adding more features or examples.
Support for Windows Forms is not planned, this library is currently for WPF only.