[Coleus]

I don't believe local bishops have the authority to change or add anything without Rome's approval.

Right, sort of, Rome gives the "conference of bishops some say in what is done at mass>>>

The GRIM gives Bishops leeway in regard to certain practices. For example with the Lord's Prayer, there is nothing to say that hand holding is NOT allowed meaning it can be done, etc.

Is it stated somewhere that you MUST Kneel after the Lamb of God? I don't thing is says that. the word "should" is not "must", then the word "except" appears, then it gives license to the "conference of bishops" to make a decision.

From the GRIM:
They should kneel at the consecration, except when prevented by reasons of health, lack of space, the number of people present, or some other good reason. However, those who do not kneel at the consecration ought to make a profound bow when the priest genuflects after the consecration.

But it is up to the Conference of Bishops to adapt the gestures and posture in the Order of the Mass to the customs and reasonable traditions of the people according to the norm of law.

[rogator]

"For example with the Lord's Prayer, there is nothing to say that hand holding is NOT allowed meaning it can be done, etc."

I am not trying to be argumentative but I never understood this line of reasoning. I thought that the GIRM prescribed not proscribed liturgical actions. By this line of reasoning anything from shuffleboard in the main aisle to throwing the money at the foot of the altar at the collection could be justified.