When I am debugging a workflow, it'd be handy to see what the properties are. Instead of the useless tooltip that reads "Editing is disabled when designer is in read only mode" (duh, as if that needs to be said), it'd be much more useful to have the tooltip show what the value under the mouse is. So if I had an Assign activity (x = SomeExpression) the "SomeExpression" should display instead of the useless message.