DF, The Pope doesn't have the authority to make contraceptives moral any more than he has to ordain women.
Contraceptives being immoral are part of the constant teaching of the Church, and therefore it cannot be changed.
I realize that there is a faction of people in the church who want so badly to see the teaching changed, that they are looking for any chink in the churchs armor to exploit. For those people, things like this seem mighty tastey I am sure, however rest assured, the teaching of the Church will not change.