It goes without saying that this type of driving is only really viable in tunnels where adhesion isn't an issue!
A previous PDP forced us to use step 2 first because of adhesion. The intent was to force the WSP into action. Engineering was not happy with that policy. It was also in place because not all units apply sand in all brake steps. By using step 2 at all times it meant that sand would be applied in any unit you were driving. I don't like auto-sanders and prefer manual sand (which I use quite liberally) but it does highlight why bespoke policy is needed.
Then of course, we were discouraged from using sand on accelleration and also discouraged from using it too much, in case the next Driver needed it. PDPs really are a blessing and a curse.