If you double click a LabVIEW step in TestStand, currently it will sometimes enable you to edit the name of the step. I think it would be better to have a double click open the LabVIEW VI that is called by the step as that feels more natural then right clicking the step and selecting edit code.
This is available in 2016 and later:
http://zone.ni.com/reference/en-XX/help/370052AA-01/tshelp/infotopics/2016whatsnew/#Open