When AllowPurchaseSuggestionBranchChoice is set to allow, the patron can pick the library the suggestion is for in the OPAC. It would be nice if there was also an option "Any library" if the user doesn't care which library the book is purchased for. Suggestions for any library would be visible to all libraries in the staff interface until the status is switched and a library is set.
The old system preference has been replaced by the 'library or branch' option of OPACSuggestionUnwantedFields, but this feature would still be nice :)