Thanks, Jo. I haven't seen any tooltip (yet, I'll check more carefully), but I must say the tooltips in other areas are often very flimsy, and only pop up at very small mouse areas. And I work with a Wacom pen, but there should be no difference I presume.
When I need to check objects I just 'fly' over the area, zoom in until quite close and pick the object. I'll experiment some more.