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ClinSpark currently does not support a way to apply the ‘fast web view’ setting to PDFs.
You can edit PDFs in Acrobat Pro to set the ‘fast web view' option may be able to achieve this in bulk by using one of Adobe’s ‘actions’. See https://helpx.adobe.com/ie/acrobat/using/optimizing-pdfs-acrobat-pro.html
Depending on the viewer used to open the PDF output, bookmarks may be expanded when the document is first opened. Some viewers correctly present the bookmarks as closed.
ClinSpark has no direct way to set the ‘inherit zoom’ property of the PDF output, but we believe that this works under typical conditions.