Rename and reorder the Add > Curve menu for clarity.

It should be something along the lines of

• Bezier Path
• Bezier Circle
  • (tooltip: A Bezier Path preconfigured to form a perfect circle with the Cyclic property actived on the Active Spline.)
• Nurbs Path
• Nurbs Path (Extend to Endpoints)
  • (tooltip: A Nurbs Path that extends to the first and last control point )
• Nurbs Circle
  • (tooltip: A Nurbs Path with W attributes on corner points preconfigured to form a perfect circle with the Cyclic property activated on the Active Spline)

A few key words in tooltips can save beginners DAYS of searching and only finding wrong answers.