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The PDF library has a way to set the PageHeight, but this cannot be done dynamically based on the content. The PageHeight needs to be precalculated.
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There are conversion routines from PixelsToMillimeter and vice versa
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There is a library called TTMSFNCGraphicsPDFEngine which is capable of applying the same code as you would use when custom drawing within FNC, there you can specify parameters to center text.
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The PDF Lib is capable of rendering mini HTML, so I would assume you need to apply a TAG before adding the text to assure indenting of the text within a paragraph.
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In the same way as 3
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That is correct.
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Images can drawn within a stretching rectangle in the same way as 3 with the separate graphics engine.
Some references: