I've noticied that after I create a new discovery rule and it's enabled, it doesn't actually run until after I restart the zabbix_server process. Which makes me wonder, with as many different "poller" type processes, is it possible to implement a feature where I can restart the individual processes? It could even fold up into the runtime control.
i.e. "zabbix_server -c zabbix.conf -R discoverer_restart"