[Charter]

Just change it in the config file:

define('SPIDER_MAX_LIMIT',20);                   // max (re)index search depth - used for shell and admin panel dropdown
define('RESPIDER_LIMIT',5);                      // max update search depth - only used for browser, not used for shell

define('LINKS_MAX_LIMIT',20);                    // max (re)index links per - used for shell and admin panel dropdown
define('RELINKS_LIMIT',5);                       // max update links per - only used for browser, not used for shell