XSLT extension functions with a security manager

Hi,

Is it still possible to use XSLT java extension functions when a
security manager is set ? 

According to the JAXP 1.3 documentation and my experimentations with
OpenJDK 6 and Oracle's JDK 7 when a security manager is set the
FEATURE_SECURE_PROCESSING is automatically set to true and it is no
longer possible to use extension functions nor to reset
FEATURE_SECURE_PROCESSING to false.

This behaviour breaks my application since it relies on a security
manager and uses java extension functions. How can I re-enable the
extension functions feature ?

Regards.