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I think you are misinterpreting the plugins documentation. I think what it is saying is that you can select one of the three predefined methods that the plugin supports, and that is done by creating a custom column such as #pagemethod, and then for books you want to use a different method place the value fast, accurate or pagebreak in that column.
The custom method does not let you modify the formula used, just select which one to use.
What you probably need to do is to define a new custom column that is a computed column based on other columns, and set its value to 1.4 * #column_where_page_count_has_been_stored.
When I sit down at my PC I'll try to give more precise instructions.
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