The other effect of the FE shutting down no.2 when it was still producing power was to disable the 'green' hysdraulic system (driven from engines 1 & 2; no.1 had already failed). With no 'green' system, the u/c could not be retracted adding greatly to the drag.
The shutting down of no.2 was probably the single worst thing the crew did (would you shut down a power-producing engine with one already out, past V1, and the aeroplane nor yet airbourn but committed?).
That's if you don't count the downwind t/o, overweight, and overfull fuel tanks (so no air gap to be compressed if the tank gets clouted by, say, a bit of burst tyre). That's why the tank ruptured (from inside, by a hydraulic overpressure).