No, a Pause object will pause everything so the image and audio cannot be paused separately.

However, if you are using the Pro edition, instead of inserting a Pause object, you could insert duplicate frames from the length of time that you want the movie to appear paused for:

  1. Select the frame that you want to duplicate to simulate a pause
  2. Disable editing for the audio track by clicking on the title box (the red highlight will disappear when the track is disabled for editing)
  3. Right click on the selected frame and click the Insert Frame(s)... option.
  4. Enter the length of time (in seconds) that the movie image should pause for