Ah, so yes, if it's like that, it's a tiny but true "roundabout" - not a "mini-roundabout" since it has something that prohibits driving over the center. 

So...to answer your question about automatic drawing... Nope, nothing is automatically drawn, heh.  So to properly do this you could draw a little circle for the roundabout (you can use the "circle" tool to make a really rough circle, i.e. a triangle or a square even, and turn it into a circle) and draw the roads to it.  Or I think in this case you can just leave it as a crossing intersection and tag the cross intersection with junction=roundabout and direction=counterclockwise much like that second example photo in the wiki with the black corrugated pillar with arrows on it.   Hope this is clear enough?