Ability to add custom pre-set publication date to facets, e.g. "Ten years".
It is currently possible to use pre-set publication filters in the Publication Date facet, with "Last 12 months", "3 years" and "5 years" as options. However, it would be useful to toggle, i.e. both add and remove, pre-set publication filters for this facet in the Summon admin centre for Search Results and Advanced Search.