I suppose that's not so easy to implement since it requires saving in the database which tools you have used. But that's for Mike to say and decide.
But did you consider using the favourites menu for "toggling" your favourite tools. That's not a 2 finger tab, but 2 taps with a finger.
But did you consider using the favourites menu for "toggling" your favourite tools. That's not a 2 finger tab, but 2 taps with a finger.