We'd like the ability to specify named filters from within a feature. Rather than specifying a full query filter in the parameters of the query itself (which can be lengthy and take up unnecessary space in the URL to be fetched), PageBuilder should provide a way to use a "named" filter that only exists on the server, and can be referenced by that URL. This would save space in the URL and make it easier to reuse filters across different queries.
This is a great idea and we're looking into implementing this on our roadmap!