Stagger is awesome I already added to my workflow and I cannot live without it. But there is a bug with inherited Subtools, when changing the Target Stage or Home Stage.
Being more specific, this is the workflow I follow.
I usually create a new geometry within a Subtool and use Split, and the positions of the Stagger are inherited to the new Subtool which is cool, you can still Switch Stage and it is working. But if you want to change the Target Stage or Home Stage alone it breaks the other Stage. If you change both Stages is still ok, but when you change only one the other one breaks.