To change the threshold, go to settings -> Orion thresholds. But this is a global setting for all drives,.
For your advanced alert question. This is possible but you would either need to make a different alert for each server, or make different conditions that match each server and set the thresholds. It would probably be easier to use custom properties and match the servers with these values. Example, small, medium, large.
I am not sure about your 2nd question. Maybe someone else knows of a shortcut.
Zak Kahl
Loop1 Systems