Hi Aleksander,
Parametric profiles are not currently on the radar. I’m not really sure exactly how that would work either, needs some thought 
For profiles with complex constraints it wouldn’t necessarily be more intuitive to use Grasshopper, or even work at all - see e.g. this post about constraint solving: Geometric constraint -- Line tangent to circle - #11 by DanielPiker.
If fixed profiles with multiple cross sections is enough that might be easier to pull of.
Cheers,
Sebastian