I posted an experiment on ni.com. It's a unique approach to making extensible options dialogs. I have no idea if the parts of it that don't work can be improved, but Yair asked me to post it publicly -- I built it over the course of yesterday and this morning in response to an experiment he tried on his end, which inspired my attempt. You can read more and get the VIs here: http://forums.ni.com/t5/LabVIEW/An-experiment-in-creating-compositable-user-interfaces-for/m-p/1262378#U1262378