text: I feel it would be best to draw it as a circle and tag it as junction=roundabout since you would need to enter and exit the circle in order to turn or go straight. This method would be more informative for anyone using the data. Also, sorry for not responding- I rarely check the email my account uses (we really should also be getting notifications on this site for note comments/changes and changeset comments).
  Could you find an example of an intersection that would allow you to make a straight left?