I have a PDF that I would like to crop to text and then add consistent white space (margin). The PDF was generated by a Bookeye 4 scanner. Which exported the content straight to PDF. So, I am trying to do this with Adobe Acrobat 9.2. SIL Americas Area Publishing suggested that I use ScanTailor - An excellent program, but one which I find crashes on OS X.

To learn more about Cropping I watched this video, but it did not answer my questions.

This ScanTailor video does show how to do what I am talking about in ST, when he talks about soft and hard margins. But that is not an OS X or Adobe Acrobat Pro solution.