Have the option to have a shorter than 30-second time to activate alarm

Having time to deactivate the alarm when arriving home is good.  However, a 30 second delay for the alarm when someone just broke down a door or opened a window  while I'm sleeping upstairs gives the perpetrator 30 seconds to make it to where I am before the alarm activates. An earlier alarm may scare them off and/or give me a better chance to respond before they find me.

I would like there to be an option to have a much shorter time between event and activation.