Display subject distance in Lightroom metadata

The EXIF data in the Lightroom database includes SubjectDistance but this does not appear in the Metadata windows.  It would be very handy if it was.
(forgive me if I have overlooked it).
(note: SubjectDistance is not recorded for all camera/lens combinations, eg 7D and Tamron does not)
As a further and natural extension, you could then easily calculate and display Depth of Field estimates (Near/Far limits and total DOF)

Digging deeper ...
The Lightroom database has a table called AgHarvestedEXIFData, which has columns for aperture, focal length etc but not subject distance.
There is also a table called agAdditionalMetadata.  This has a column XMP which is xml format EXIF data etc, including <SubjectDistance>
So the data is in the database but not in the table which is used by the MetaData tab in the Default view option.
So why does it sometimes show for you?
The clue is the heading Shooting Info on your screenshot.  I don't get that.  However if I switch though to the EXIF option instead of Default the list of EXIF data fields changes, enough to make me think it is using different code.  I think in some circumstances it is clever enough to extract the data from the XMP field and push it into this form. I picked up a few 'Shooting Info' threads in the forums, bemoaning the loss of this data too.  Why sometimes and not others?  It might be your camera model/lens/focus mode, but possibly did you shoot tethered?
Here is a sample of some of the XMP data - as you can see there is a lot of useful shooting information available but not accessible!
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 4.2-c020 1.124078, Tue Sep 11 2007 23:21:40        ">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
    xmlns:tiff="http://ns.adobe.com/tiff/1.0/">
   <tiff:Make>Canon</tiff:Make>
   <tiff:Model>Canon EOS 7D</tiff:Model>
   <tiff:Orientation>1</tiff:Orientation>
   <tiff:ImageWidth>5184</tiff:ImageWidth>
   <tiff:ImageLength>3456</tiff:ImageLength>
  </rdf:Description>
  <rdf:Description rdf:about=""
    xmlns:exif="http://ns.adobe.com/exif/1.0/">
   <exif:ExifVersion>0221</exif:ExifVersion>
   <exif:ExposureTime>1/160</exif:ExposureTime>
   <exif:ShutterSpeedValue>7321928/1000000</exif:ShutterSpeedValue>
   <exif:FNumber>5/1</exif:FNumber>
   <exif:ApertureValue>4643856/1000000</exif:ApertureValue>
   <exif:ExposureProgram>3</exif:ExposureProgram>
   <exif:ISOSpeedRatings>
    <rdf:Seq>
     <rdf:li>100</rdf:li>
    </rdf:Seq>
   </exif:ISOSpeedRatings>
   <exif:DateTimeOriginal>2010-12-30T15:56:15.83+13:00</exif:DateTimeOriginal>
   <exif:DateTimeDigitized>2010-12-30T15:56:15.83+13:00</exif:DateTimeDigitized>
   <exif:ExposureBiasValue>0/1</exif:ExposureBiasValue>
   <exif:MaxApertureValue>4625/1000</exif:MaxApertureValue>
   <exif:SubjectDistance>317/100</exif:SubjectDistance>
   <exif:MeteringMode>5</exif:MeteringMode>
   <exif:Flash rdf:parseType="Resource">
    <exif:Fired>False</exif:Fired>
    <exif:Return>0</exif:Return>
    <exif:Mode>2</exif:Mode>
    <exif:Function>False</exif:Function>
    <exif:RedEyeMode>False</exif:RedEyeMode>
   </exif:Flash>
   <exif:FocalLength>70/1</exif:FocalLength>
   <exif:CustomRendered>0</exif:CustomRendered>
   <exif:ExposureMode>0</exif:ExposureMode>
   <exif:WhiteBalance>0</exif:WhiteBalance>
   <exif:SceneCaptureType>0</exif:SceneCaptureType>
   <exif:FocalPlaneXResolution>5184000/907</exif:FocalPlaneXResolution>
   <exif:FocalPlaneYResolution>3456000/595</exif:FocalPlaneYResolution>
   <exif:FocalPlaneResolutionUnit>2</exif:FocalPlaneResolutionUnit>
   <exif:PixelXDimension>5184</exif:PixelXDimension>
   <exif:PixelYDimension>3456</exif:PixelYDimension>
  </rdf:Description>
  <rdf:Description rdf:about=""
    xmlns:xap="http://ns.adobe.com/xap/1.0/">
   <xap:ModifyDate>2010-12-30T15:56:15.83+13:00</xap:ModifyDate>
   <xap:CreateDate>2010-12-30T15:56:15.83+13:00</xap:CreateDate>
   <xap:MetadataDate>2010-12-30T19:48:23.959-13:00</xap:MetadataDate>
   <xap:Rating>2</xap:Rating>
  </rdf:Description>
  <rdf:Description rdf:about=""
    xmlns:dc="http://purl.org/dc/elements/1.1/">
   <dc:creator>
    <rdf:Seq>
     <rdf:li>Paul Willyams</rdf:li>
    </rdf:Seq>
   </dc:creator>
   <dc:rights>
    <rdf:Alt>
     <rdf:li xml:lang="x-default">Copyright Paul Willyams</rdf:li>
    </rdf:Alt>
   </dc:rights>
  </rdf:Description>
  <rdf:Description rdf:about=""
    xmlns:aux="http://ns.adobe.com/exif/1.0/aux/">
   <aux:SerialNumber>670502410</aux:SerialNumber>
   <aux:LensInfo>28/1 135/1 0/0 0/0</aux:LensInfo>
   <aux:Lens>EF28-135mm f/3.5-5.6 IS USM</aux:Lens>
   <aux:LensID>178</aux:LensID>
   <aux:ImageNumber>0</aux:ImageNumber>
  <aux:ApproximateFocusDistance>317/100</aux:ApproximateFocusDistance>
   <aux:FlashCompensation>0/1</aux:FlashCompensation>
   <aux:Firmware>1.1.0</aux:Firmware>
  </rdf:Description>
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