I think would be useful to have the option for triggers to have a custom number of statuses (to allow even 1 status only, not OK/PROBLEM).

A sample of this is when is needed to monitor restart of a service. I don't think the dual OK/PROBLEM is appropriate. Rather is normal to have only one status (as PROBLEM or INFO only). Of course, the notifications/actions can be customized to only send notifications per initial PROBLEM. But still, in the system are registered 2 events, bot the PROBLEM and the OK....