I don't know about the quality, good or bad, of the Funei group, so I can't say, my observation only is on that I don't believe their assertion that there is some secret teaching that somehow bypassed Pan-hou's students.
My teacher's ancestors were Imperial bannermen, officers of the elite palace battalion, who learned from both Lu-ch'an and Pan-hou. So there is "Imperial" T'ai Chi still being taught out there. As well, Yang Ch'eng-fu was Yang Chien-hou's son, not Pan-hou's, so his lineage is Chien-hou's.
The things you are mentioning were only taught to very advanced students, disciples of the family, in the old days. If the current Yang family members don't teach them (I don't know if they do or don't), they have a good reason (there are trainings in the Wu family that are no longer taught, because they have beeen replaced by newer systems), usually because they teach something more efficient that does the same thing. Yang Ch'eng-fu and Wu Chien-ch'uan did quite a bit of research on T'ai Chi in the 1920s, and their results went beyond what went before for their purposes. Traditionally, it is recommended to learn a complete system from one school without adding outside things on willy-nilly.
[This message has been edited by Polaris (edited 05-03-2005).]