Hi Marco, one possibility for getting low level access to a curve's control points and knots right now would be to export your curve to 3DM format, and then write a c++ helper .exe program that would read the 3DM file and write out the data you need to a text file that could then be read in by your script.

You can open 3DM files in your own c++ program using the OpenNURBS library which is available from here: http://opennurbs.org/

- Michael