well, it is OK to add the Gloria to a Mass for the sake of greater solemnity.
For the record, this is what the Canadian Ordo says in a special note: The celebration of All Souls this year must be different from other years. Even though this might be difficult for our culture, efforts must be made to place this celebration within the context of the paschal mystery. The focus of this Sunday's liturgy must remain on Christ, on his death and resurrection; it must not be displaced by undue attention to the faithful departed. We celebrate them today insofar as they participate in the death and rising of Jesus Christ. White vestments are more appropriate today.
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