The dialog box for member eccentricities corresponds to the dialog box for the calculation with 6 degrees of freedom even when using the Warping Torsion add-on (7 DOF). The RFEM manual describes the function of member eccentricities in the chapter Member Eccentricities.
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Connection Point to Adjacent Components
If other objects are connected to a member to be calculated with 7 degrees of freedom, the connecting point is always assumed to be at the center of gravity. Transverse loads from an adjacent structural component or support thus generate an additional torsional moment depending on the location of the shear center.
When calculating members with 6 degrees of freedom, however, lateral forces from other structural components are introduced at the shear center. Axial forces from other structural components are transferred at the center of gravity in both cases.
If the connection is to be made at a different point, you can model the connection with rigid members or use member eccentricities.