I think we are asking the same question.
I would like to pick, say 5 points on this spline and move them. You can not box the points and choose them, as far as I can tell.
It would be similar to something called "pick walking" in other programs, and maybe possible in Solidworks in the Surfacing/Sub-D portions.
But, please fix for sketched splines!
Peter
I think you can ctrl click to select multiple points and then move them.
Also, Peter, you could probably get away with a lot less spline points to get that curve.