I haven't tried this so take it for it's worth but, perhaps you could generate your curve using a design table driven spline with the number of reference points you desire. Then import the X-Y coordinates as an Excel table into your drawing.
I know this is an old post, but I just had to do this and was excited that I figured out a way around the limitations of SW so I wanted to share :-)
I have an elliptical surface to be machined without CAM software. So....
Make a sketch and convert the contoured edge.
Make an intersecting line and linear pattern it for the resolution desired.
Add a hole feature and put a hole at each intersection of the edge and pattern.
Make a drawing and add a hole table of that feature.
Save as PDF.
Open PDF, select hole table data, copy, paste into Excel. (but it puts each row into a single cell, it doesn't separate the data)
Save as text.
Open text file and set "space" as a delimiter. Voila, X,Y data table for the points in question.
At least with this scheme when you update the geometry you just have to save a new PDF and re-do the Excel portion.