offset lines is working fine but with curves you loose the fit points it basically creates geometry that I hardly can work with.
I cannot sculpt it, point snap does not work and such - specifally when offset and needing to adjust the curve this is a dead-end
because extend also does not work with the off-set curve.


here is an example:
check the blue line, in Alias I can offset the lines easily, the curves I would offset with the same geometry as I do not need 100% the same result
for a snapping mechanism and then the ends of the offset curves I could extend over the linear offsets from the head.

So this would be a good opportunity to stress again the need of tools like: fit rebuild and CV curves. Then we can extend those offset curves.
Here is a screeny about how I would do this in Alias:
https://drive.google.com/file/d/0Byzv_NlyKp_2aFNCZnMxUUEzMU0/view?usp=sharing