My company operate A319/320 but we use MSN specific QRH so no need to check the MSN on the bottom. In the event of RTO, once the park brake is set we sit on our hands, take a deep breath and decide who called stop and why. Capt is responsible for all commmunications with cabin and ATC, FO carries out all ECAM drills unmonitored. For the engine fire case, our QRH contains the ECAM actions (shaded) followed by the rest of the QRH checks so it's easy to see where you pick up the checks after both engines are off. In the event of an evac its both engines off and APU if applicable (rarely) and all bottles discharged. Capt will initiate the evac, cabin crew can only intitiate in clearly catastrophic circumstances (aircraft's breaking up, visible flames or stopped on water). Any other comms with the cabin take a low priority until we're satisfied the emergency is under control