Ignition Override;
I didn't know about the Eastern incident. I know we had an accidental deployment at 350 on a '9 in the late 60's early '70's; it tore the reverser off, rolled the airplane near 90deg but the crew recovered.
A reverser deployed accidently is indeed a very serious circumstance from which recovery can be difficult to not possible depending upon flight regime and the stated crew coordination. The 320 drill was to "control roll with rudder, perform the engine shutdown drill"...having done it in the sim it was "academically" controllable if you were quick but it was no mere engine fire (which is even simpler than an engine failure most times), again, as stated.