Just saw this thread and am going to give my two cents here. I’m actually utilizing the battery function on my Dashboard as an alternative to see my “To-Do’s” across multiple boards.
I believe it can work by just selecting the boards you have your to-do’s on, subsequently filtering the items by a column value to appear by the necessary parameters (i.e. for Board A, “People = Me”, Timeline = Current + Overdue, ; Board B, “People = Me”, Status = In-Progress)
The only limitation to this is that I can have only a maximum of 10 boards hooked up per dashboard widget, but that can easily be solved by segregating my boards into different batteries. Still a win because this totally checks out for projects that involves multiple boards.
Main point is by doing this, I can my tasks on all boards based on the columns that are, by-nature, used to assign myself to work on it. Am I making sense?