Is this possible?
No, of course not. There is no feedback signal from the Servo for a Arduino to read. Only with external components, say a pot coupled to the servo wheel, or perhaps tapping into the servo's internal position pot would this be possible. Also I believe that just of act of attaching the servo to the software routine causes it to move to a default position (1.5msec position?), at least that is what a recent posting talked about.
Lefty