A bookmark doesn't have any text - it's just a page marker. You can also bookmark a page while reading by double-tapping the upper right corner of the page.
Are you sure that you lose lines when you display the notes menu? You don't on the PRS-600 (which has pretty much the same firmware as the 900); on the 600, when you turn on the notes menu, the text on the page gets slightly smaller to accommodate it, but displays the same number of lines.
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