Selecting multiple VRC Constraints of the same type with "Free edit" enabled and editing certain properties will set the Global Weight to the weight of the active constraint.

1) Set multiple VRC Constraints of the same type to "Free edit" and set each to a different value higher than 1

2) Select all transforms with these constraints

3) Change a value unrelated to the global weight, like the freeze axes

4) Global Weight values should now all be the same as the actively selected transform