With AxisAndOhs you can utilize BVars directly, there are no tricks and no special code is necessary. You just have to know the name of the BVar and how to use it. BVars don’t have fixed names like the others, you can attach different suffixes to make them do different things - that’s what has to be figured out from the Behavior Code. And with the InputEvents even that is no longer necessary, they just appear in the event treelist in the app.
I simply assumed that when AAO can do it, SPAD certainly will have developed the same capabilities.