Hi Alex,
In the company's SOP, there is a seperate chapter prescribing and illustrating the recommended PF/PNF actions for some (not all) non-normal maneuvers including SE ILS approach, Engine Failure at Take off, Rapid decompression ...etc. etc... Here the goal is to bring the QRH items to a visual scene as detailing them to faciliate their usage in real life.
Particularly For Rapid Decompression it states simultaneous actions as:
Capt:
*Done the Mask
*Establish the Comm (Toggle the sw to "Mask", ensure FLT INT and Speaker Receiver switches are depressed)
*Initiate the Emergency descent if Cabin pressure is not controllable
# Turn the heading about 45 degree off the present track. After 30 sec, realign with previous track
# Spin down MCP Alt
# Spindown Vert Speed Thumbwheel
# When the nose drops, select LVL Change
# Set MCP speed to VMO/MMO
# Deploy thye speed brake
# Check MCP alt is 10000 feet or MOCA
F/O:
*Done the Mask
*Establish the Comm
*Pressurization mode switch manual
*Outflow valve close, Check descent in cabin altitude and rate
*If not controllable, announce the descent to ATC and cabin crew
*Check Pax Oxyg sw ON
* Check Ign Sw is FLT
*Check Check MOCA if above 10000
* Do the CL
In general I hope these help.
Ridvan