Geofence adjustable perimeter

There needs to be the ability to set the perimeter distance for geofencing. A pre defined set perimeter is not flexable enough. I don’t want the alarm to set if I decide to go the the mail box with my phone which is outside the small pre defined geofence area. Yes I can move my house around in the set geofence, but it still isn’t enough. I should be able to set the perimeter to 300 meters or say 1000 feet. What ever I determine to be the right perimeter for MY geofence area. I can with my Insteon isy 994i smart home lighting controller so I know this is a fix that can happen in a future update.