I am wondering whether Dom's outline here(1) is really impossible:
For PoDoFoBrowser, I think it would be fine if you would have the preview side
by side with the pages content stream. And if you type some PDF code into the
content stream, like "0 0 1 rg 100 100 m 200 200 l" it should immediately
draw a blue line. But this is dreaming
I see top expert gurus such as Thom Parker have developed their own viewer/editor here(2), the PDFCanOpener. PoDoFoBrowser is also great. These guys here(3) made PDFXplorer.
So, why I couldn't find a tool like Dom's expectations. Adobe in first place should do that if technically possible. Together with Acrobat, it would exploit the creation of custom annotations.
Are there any reasons they haven't yet?