As of revision 4185, InfoURLs are supported for stars defined in stc files. They behave identically for stars as for deep sky objects and solar system bodies. The various GUIs all have to be modified slightly to support this feature. So far, I've changed the Mac OS X and Windows UIs; the KDE and Gnome interfaces need to be updated. (We should really move the InfoURL code into a single platform-independent file...)
--Chris