how to use m_pProjectionDelegate in CCDirector?

I would like to define projection matrix myself and I found m_pProjectionDelegate in CCDirector.
But I can not find any method to set it… Did the author forgot to implement it or I just misunderstand the usage of this variable?

Yeap, it is missed.
#1459 is created for it.
I am sorry about it.

You can add it by yourself.