How to create muliple instances of custom plugien?

[Pin-Hua Tien]

In plugin template, it uses

PluginManager.register('BasePlugin', BasePlugin, 'base');

to register the key and reference of that plugin.
The 3rd parameter 'base' is the "Mapping is what the plugin is injected into the Scene.Systems as (i.e. input)".
It only create 1 instance of 'BasePlugin' in scene.system by "install" function (or PluginManager.installGlobal, PluginManager.installLocal)

this.sys.install('BasePlugin');


How to create muliple instances of custom plugien?
Maybe add a function in PluginManager, to create plugin instance by pluginKey.

var source = plugins[pluginKey];

var inst = new source.plugin(scene); // return inst

(copy from PluginManager.installLocal)