Question about "Elastic Coupling"

SOFiSTiK Rhino
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In Sofistik Rhino Grasshopper interface, there is a component called “Elastic Coupling”. I have several questions about it
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  1. As for “Elastic Coupling”, which part of SofimshC manual I should refer to, SPTS or SLNS?

  2. In SOFiSTiK, the stiffness of a spring is basically defined in the unit ’Stiffness / Area’, In SPTS, there is a record “AR” to provide reference area, but this componnet doesn’t include “AR” in its input

  3. In my model, the stiffnesses of two orthognal transverse directions are different, but there is only ONE input for stiffness of transverse direction. How to solve it?