Tweaking datum curves that have curvature-continuous end contions.

Does anyone know if this can be done without using Style Curves in ISDX?

When making a datum curve and setting both end conditions to be curvature-continuous with existing edges, you lose the ability to control the stretch value of those constraints via a control polygon (in the Tweak panel).

With a boundary blend set to have curvature-continuous end conditions, you can still control the stretch value numerically. So it seems you should be able to do the same thing for curves.

Cheers