This thread is the only information that I remember about this:

http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=213631

In ancient times of acknex there has been a developer who faked a bones animation to combine it with vertex animation.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt