Hey, I don't think there are conditions for that behaviour, but you can use a global variable each for the magnitude and duration. Then you can use the variables to compare, if durationvar > 0 then it is shaking, and magnitudevar would be the magnitude value.
Thank you, my game is almost done and I've used too much screen shake so I don't want to edit them :D If I can't find a pratic way I would add vibration manually below to screen shake actions.