Karen,
You should have the option of ticking/unticking Link when you File/Place; you get the choice if you Click rather than DoubleClick the file in question.
Mainly based on reflowing text, Kindle and similar books are stripping down everything but images, so I believe there is no point in considering ID at all.
In a better (and less ugly) world, those books would have been based upon PDFs (one tiny hidden corner actually is).