Hi Ulisse,
as far as I remember (considering continuous and quick changing in my company AOM...) is not a limitation, but considering the steering orders transferring priority to the rudder pedals over 20 kts/GS, the FCTM (NO-040) "Taxi speed and braking" states that:
"on long, straight taxiways, and with no atc or other ground traffic costraints, the PF should allow the aircraft to accelerate to 30 KTS, and should then use one smooth brake application to decelerate to 10 Kt. ..."
Should...
