Its all a performence issue and I dont see an airline incorperating it into thier sops except under the heading of "recommends" as soon as an overrun happens it leaves the airline open to a whole lot.
If brake cooling times are not an issue a higher auto brake setting is prefered and use of ide reverse but as stated in all the manuals reverse thrust is more effective at higher speeds so altough no reverse thrust is taken into account for you will always apply some forum of reverse thrust may it be idle or max.
except for safety reasons
These words allow you to use reverse thrust at any setting at any time of day and the reasons can include wet/contaminated runway, crosswind and runway slope to name a few.
You'll find using a lower landing flap setting will use less fuel but again its all down performence!
cheers