custom optimized spamd configuration

hi. does anyone know how I can adjust max-spare, min-spare, and min-children options of the spamd startup config ? the only spam assassin options that I can see changable in the gui are: allowed-ips, max-children, max-conn-per-child, timeout-child, timeout-tcp, and nothing else. is there any way to get additional options into cpspamd.conf ? thanks.