here is a list of things I like to have in Endnote
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Bulk edit of fields by marking the references in the reference window and editing them in the reference panel (similiar to mendeley)
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renaming of files for figures too
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options for the placement of attachments ( like in mendeley, where you can automatically name and order your files accoring to fields)
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More options for views in the PDF viewer (two pages, full view)