Samsung Instinct M800

Is there a way to set this phone to road only, I do not get a good signal at my house and need it to lock to road only... I have noticed that sprint is taking that option off of the new phone and replacing it with automatic or sprint only. Does anyone know why??? I read that with the TOUCH Pro that you can go into the registry and change it to automatic B and wonder if the same trick will work with other phones.