‐ On dry runway only and if landing performance permits, the flight crew can select and maintain REV IDLE until taxi speed is reached.
Well that's what everyone's been doing anyway?
For any other case, immediately select REV MAX on all reverser levers after main landing gear touches down.
For a wet runway (<3mm) its ok to revert to idle if deceleration is adaquate (if that's what you want) but for ungrooved runways I keep full bore till 70kts.
The flight crew must select REV MAX if the aircraft is affected by any failure that impacts the landing performance, or if required due to an emergency.
And that NEEDS to be written into a SOP? 
A slight pitch up that can be easily controlled by the pilot, may occur when the thrust reversers are deployed before the nose landing gear touches down.
Covered during endorsement on both the 320 suck-squirt and the 737.
‐ After the flight crew selects reverse thrust, they should perform a full stop landing.
Even my old DC9 SOP said the same thing. Every jet jockey's golden rule.
Far as I see Airboos has to state the bleedin' obvious to cater to the lowest common denominator - ie your 200 hour kid in the RHS, as well as the lowest form of life - parasitic lawyers.