How to use Photon Plugins?

I use Photon 4 Plugins to extend the Game/Room behavior.

Here is how i use it:
1. I save the room data in Plugin, i think one plugin one room, is that right?
2. I override OnRaiseEvent() to deal all custom logic, and use data that was saved in the plugin.

Do i need to consider multi-threaded or Asynchronous task problem?

public override void OnRaiseEvent(Photon.Hive.Plugin.IRaiseEventCallInfo info)
        {
            if (info.Request.EvCode == ClientReuestTask)
            {

                //Do many task.
                //What will happen if i sleep here? Other room logic will stop?
                info.Cancel();
            }
            else
            {
                base.OnRaiseEvent(info);
            }
        }