The Bookends user guide (p.275) doesn't say it supports this, but does support a generic argument=. How can I get Bookends to put the DOI or PMID in the right place?&rft_id Identifier Descriptor for Referent. To specify DOI (info:doi/VALUE), PMID (info:pmid/VALUE), UT (info:ut/VALUE).
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As an aside, it would be much better if we could edit Server URLs and their Search Arguments as a pair. As it is OpenURL Search arguments cannot be specified for different servers, and the box takes up lots of UI space. Having a single list with two columns [SERVER | ARGUMENTS] would IMO be more useful.