1. On the thrust vectoring thing, yes they are in controlled flight but I think mostly because of the fact that they can control the thrust nozzles and not becase of the control surfaces IMO..

2. In a harrier I am pretty sure the wing is only providing deflection and not true lift as it does in normal flight... A stall is when the wing's drag is greater than the lift it creates right? Either way I am pretty sure that in a harrier the wing is considered totally stalled and thrust is the only reason that the wing overcomes the drag...