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Well, I do not know how Kindle handles it.
I am affraid there is not a simple solution for all cases. I am not sure, if pdf file structure has direct means to tell "shown" page number. I sort of doubt it, but I may be wrong.
The numbering schemes in documents may vary quite a lot. It may use arabic numbers, roman numbers, alphabeth, ... And within one document different numbering schemes may be used. Make it even more difficult, the numbering counter may be reset at each chapter or even subchapter. The shown page number may look like C-XIX.8.2.
I guess, software should be able to guess the shown page number, but what if the guess is wrong?
I thing, your request is quite sound, but I wanted to point out that the solution is not as easy as it seems to be at the first sight (to substract certain offset from "real" page number to get "shown" one). I guess, it could be implemented in a way, that shown page becomes part of the text (as prefix) that goes to "heading". User could correct it if the automatic guess is wrong.
This might be easy to implement, I guess. If Onyx is going to improve M92 firmware.
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