Howdy,
If you constrain the points to Null objects, you can then animate the Null objects to control the spline points. This will give you more control over the animation of the spline, because you then have access to the Null objects' Fcurves.
My CD Constraints plugin includes a CD Points Constraint which makes it easy to setup:
http://www.cactus3d.com/CDPointsConstraint.mov
Adios,
Cactus Dan
Cinema 4D R10 XL Bundle, BodyPaint, Dynamics
www.cactus3d.com
www.cactus3d.com/Plugins.html