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.........does it work all the time, even with the key off?
On Packards that used the accelerator pedal start, the engine will not crank with the key off. On later right or left position ignition switches used from 23rd series on, it will crank with the key in either accessory or run position. The coil only gets power in the run or right position so even though it cranks in accessory or key to the left it won't start.
Once the engine is running, if the adjustments of the start switch mechanism at the carb are correct the starter will not engage again until the engine stops and vacuum is lost. If the mechanism is out of adjustment or the vacuum section is not functioning it is possible to engage the starter with engine running. Cars with the 356 engine and senior 51-2 models went a step farther with a starter safety circuit that takes ground away from the solenoid once the generator is putting out voltage. With no ground, the solenoid can't pull in so a prevention to accidental starter engagement.
IMO, biggest downside to the accelerator switch becomes when the engine fires but fails to catch on the first or second try. Each time you press the accelerator you pump gas into the carb. Finally it becomes flooded in addition to whatever the reason was it didn't catch the first time so you have to sit and wait for gas to clear before trying again. With the pushbutton, should it not catch you can always crank the engine with the pedal not moving and clear the flood quicker.
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