In some cases, a higher availability of customers may be required. In these instances, a hybrid approach would be to pull into the Default Active Saved Search only customers that have (say) purchased in the last year. Alternatively, if your customer base is centered around specific stores, you could set up a POS Settings Saved Search that pulls in such customers and confine them to a specific store. This will leave your most popular customers available locally and if they are not found, the customer can be pulled on-demand.