I was asked a while ago about absence of ability to trigger the trigger_hurt offline and online.
Well, the answer is yes you can, the code is there (e.g. it was always there) and all you are required to do is to add 2 to spawnflag value. This will allow to switch the trigger_hurt between online/offline states by triggering it (by button, etc).
The trigger_hurt will always spawn online, even if you set the spawnflag for it to spawn offline. You can always use trigger_always to trigger it off on map start.
Troy.