how to make JW Media player go on downloading while paused or before starting of play (beyond buffer)

I have noticed other players go on downloading before the user clicks play (they load all the file, not just the buffer - autoplay disabled) or go on downloading when the user pauses.
Is there a way to instruct JW Media player 4 to behave this way?
Putting a large value for buffer is no good because it delays the beginning of play.