Mutt
True improved climb is only permitted when you can’t get enough weight with normal climb speeds (unless the runway is contaminated and the antiskid is u/s) because of the increased risk associated with the higher runway speeds. I have seen figures for a Vr of 175kts in a 737-300 !!! Do Airbus not consider these speeds an increased risk?
As an aside, UK CAA operators of the 737 always use “Alternate performance” when using normal speeds. This means using a slightly higher (5kts) V2 on the assumption that the autoslats will not work when you need them. This effectively means that every take-off is done as a mini improved climb. Since the 737 is usually climb limited, this has the net effect of improving almost all of our data (ie all except field limiting cases). In every other aircraft I have flown, allowing for unservicabilities worsens your performance, not the 737. Confused yet? I am.
S & L