Customize items in Structural Member feature

is it possible to customize the pulldown items in the Structural Member feature?
(like the ones for Autodesk in ventor where you edit ab XML database file to add custom items..)

or better if it is possible to have the items under "Toolbox>>Structural steel..." in the Structural Member feature?

i really hope i can do this.
hope anyone give some tips on this.

TIA.

--JanSolidworksWeldments