I have a relatively similar scenario. The default constraint axes are… inconveniently rotated. I believe the offset parameter has been removed in favor of directly rotating the constraint. In fact, translations, rotations and scales are available as they normally are in Persona, the level editor, etc.
I guess this would pretty much remove the necessity for an offset as you can determine the constraint center on all axes.
However in my honest opinion, this is extremely difficult to control as the rotation of one constraint axis affects the overall constraint rotation in a seemingly non-intuitive fashion.
After some experimenting I’m not even sure if these operations were intended… rotating the constraints in this manner cause some weird behavior.