Photoshop :: PS 10 Save As Removes Camera

I have Photoshop 10.0 (Windows XP) and use it to edit my photos from my new Nikon D300 camera. I create and maintain my images in JPG format as a preference and have no plans of saving in RAW. My D300 includes 40 to 50 camera info/metadata elements including the camera and lens settings at the time the photo is taken. When I do a simple "Save As" in Photoshop 10 to a new JPG file (whether image adjustments are done to the source image or not), the new JPG file is stripped of about half or more of the original camera-specific metadata elements. Is there a Photoshop setting or Nikon/Photoshop plug-in that will force the software to preserve/retain the original metadata? (The Capture NX2 solution is not an option as the one key feature I use is Auto Levels - The Auto Levels feature in Capture NX2 washes out my photos to an undesireable state). Therefore, I need to continue using Adobe for the benefit of their better Auto Levels feature and I also use their automation heavily as I process 100's of photos at a time. The only drawback of Adobe right now is they discard most of the camera specific shooting data at the time of save. RAW is not an option as the file sizes are too large for my storage, sharing and usage needs.