This would be a great feature to see. For example, have payment-plugin1 set as the default, but a different payment plugin could be enabled for an organizer. If payment plugin is default, then it uses the "master" plugins, but if a particular plugin is enabled in that organizer, then that plugin would override and only show. To support multiple different plugins, for example paypal on several different organizers, it would require some customizing of the paypal plugin by the website developer to "customize" the plugin making it unique.