All done before !
Twenty years back Dan-Air (remember them?) started taxing the B727 to the hold with the #2 engine shut down, it was then started just before take off as a fuel saving measure.
The number of # 2 engine failures dramaticly increased mostly due to the engine thermal stress that resulted when a cold engine was set to take off power.
All this nonsence will stop when the first few big fan's go bang!.