First about my batch file. I tried it with different situations, also I tried the variant as you said (rotate (inside DPP) Horizontal taken image to the right and convert), but I didn't find any troubles. There was no endless loop, all worked correctly. It is strange...
I absolutely agree with your reasoning.
>one can never be 100% sure
You are quite right :-) That's why I am happy to discuss this issue with you. Two heads better than one.
>Why don't you make a "package"...
I'll think about it :-) But, as I have said, I'm not a programmer, and I'm not sure that my batch is good and safe. I've received at least one feedback from you - and I'm very glad about that ;-)
>they will make their wishes anyway
Sometimes user's wishes are very useful. Public discussing can improve software very much. The main problem, as you've said, is time. I'm very surprised of Phil - he answers every question on this forum! It is strikingly, and deep respect to him!
I hope, you do not look on our discussion like on "just a wish" ;-) After all I try to realize my own way, not to make you to do it.
By the way... I've already asked Phil about the order of different tags (http://www.cpanforum.com/threads/10112) and I see that these changes are not important. But I find interesting thing. When I change thumbnails, previews and other tags in different combinations, in all cases the tag "ThumbnailOffset" saves it's value (thumbnail saves it's position in CR2 file). But when I use GUI, this thumbnail moves to the beginning of the file on 430 bytes. I tried it many times, but standard it is 430 bytes.