After reading through the thread on this mailing list, on the JSC forums, and googling, it seems that it could theoritcally be possible to simply update the existing myfaces-extensions.jar file with a modified MANIFEST.MF and sun-faces-config.xml file.
Jar -uf myfaces-extensions.jar META-INF/sun-faces-config.xml
With the 'correct' sun-faces-config.xml, this should alleviate the IntrospectionError that normally happens. Has anyone created a sun-faces-config.xml file for use with myfaces-extensions?
-D