CinemaDNG operation in AE and Premiere CS 5.5?

Question

I worked my way through using CinemaDNG in AE and Premiere. But, there are differences that are me causing confusion:
1) In AE, I use FILE > IMPORT FILE... and select the first DNG file in a folder. The CinemaDNG panel auto-opens. After making adjustments and clicking OK, I can double-click the FOLDER name and the first frame appears in the video window. I can play the file.
2) When I need to alter my adjustment,  I must use the FILE > REPLACE FOOTAGE > FILE (and select the first DNG file in a folder) command. Is there a simpler way like Premiere's CLIP > SOURCE SETTINGS command?
3) When I REPLACE FOOTAGE, it has the modified images. NOT, the original footage! Which rasies two questions: Where are the adjustments one makes SAVED?  (Is it stored in each image file? In AE?)  Is there a REVERT command? (After making new adjustments, the video window shows them.)
4) The DNG frame-size is 2048x1092. Because of garbage on the clips's edges -- I want to CROP -- not SCALE) to 1920x1080. I have set the Render Settings to 1920x1080. I'm not useing Region or any kind of Crop filter. Am I correct that AE CROPS the incoming image to 1920x1080?
In Premiere, CinemaDNG works very differently:
1) FILE > IMPORT... and select the folder to import. After importing, I select the first clip and issue the CLIP > SOURCE SETTINGS command. Amazingly, if I made settings in AE, they appear in the newly loaded clip! This seems wrong -- the original clips should NEVER be modified.
2) Which raises the question, how to fully revert to the original images?
3) I notice Premiere places an XML file into folder --- while AE does not. What's the XML file for?
4) I notice changes made in Premiere show-up in AE -- even if I delete the XML files. Which seems to indicate the adjustments must be made to the DNG files themselves. Which seems to make REVERT impossible. Correct?
5) Premier, unlike AE, seems to have have a problem with frame-rate. In Premiere each frame is set at 1 fps -- which is wrong. After dragging the folder into a Sequence, I've tried selecting all clips and then useing CLIP > MODIFY > INTERPRET FOOTAGE... and set the rate to 999fps which forces the clips 'duration to 0:00:00:01 which is correct. But, now clips will not play. Nor, can they play if dragged into a Sequence. What am I doing wrong?
Thank you

Answer 1

Ken, I've done some additional experiments.
1) If you make adjustments to a DNG import into AE, when you click OK the first DNG file is modified. However, none of the other DNGs are modified. So it seems adjustments are written into the first DNG.
2) Each time you RELOAD FILE you have the opportunity to make adjustments to the last saved adjustments. Each time you adjust, the first DNG is modified.
3) The question is -- do adjustments overlay the camera written settings? If yes, then REVERT is not possible.
4) After closing AE, I opened Premiere and imported the same DNG folder. Unlike AE, the DNG control panel does not automatically open. If one double-clicks the first DNG, what you see seems to be the initial camera settings. Which tells me they are not over-written.
5) After selecting the first DNG, if I now issue the CLIP > SOURCE SETTINGS command -- the last adjustments made settings in AE, appear in the DNG panel.
7) Seems there are two locations for data in a DNG: a location for the camera data and one for user made adjustments. But, there is no software way of doing a revert. Since the first DNG seems to be where adjustments are stored, it turns out that if you save the first DNG before importing into AE you can REVERT by replacing the first DNG with the original. At this point I'm exporting a ProRes 444 12-bit RGB file so all I need is for AE to work.
8) If you do make an adjustment in Premiere, the first DNG is not modified. Rather, an XML file MAY be written.
9) Even after making adjustments in the panel and clicking OK -- the changes MAY NOT show-up in the Viewer! If you quit Premiere and restart, the changes you made previously MAY show-up in the Viewer after double-clicking. However, only in the FIRST DNG. None of this makes sense to me. And, sometimes you may not need to quit and restart.
10) If one wants to use Premiere, drag ONLY the FIRST DNG into a timeline.
11) Select the clip and use the CLIP > CLIP SPEED/DURATION... and drag the duration to the correct length. For example, if there are 60 frames and the frame-rate you want is 30fps, the desired duration is 02:00. Render to see the clip play at the correct speed. All in all, a very poor process. Hopefully, for others who want to use Premiere, I've made an error.