[Not sure it more relevant for CirrcusSearch or for Opensearch API action but it may be useful enhancement for both]
A good idea for search enhancement from hewiki Village pump is to use sortkey of categories for searching.
Many users try to search first the last name e.g for locating "Barack Obama" article they search for Obama, or Obama, Barack. If the search use suggestions based of default sort of category ({{DEFAULTSORT:Obama, Barack}}), people may find it easier, without need for manual redirect from "Obama, Barack".
Version: unspecified
Severity: enhancement