I'm a Machine Manager (Poll Worker) - Florida (3+ / 0-)
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and there is NO WAY IN HELL anyone would get away with doing that. We poll workers watch the machines like hawks. Also, at the end of the day the signatures in the book and the number of votes MUST AGREE, or else they will KNOW something's fishy.
There are times when the manual activation must be invoked and it is those times that a poll worker is required to STAND NEXT TO THE MACHINE so that no one can do what you have described.
It could work ONLY if a poll worker let it happen.
Now - I have to tell you - I vote in a church, and the pollworkers LEAVE YOU ALONE after sticking the key in the evote machine. They walk away and sit down - so if this above sequence is correct, someone in a precinct like mine COULD get away with this.
I have already voted absentee - so I cannot (and will not risk jail time) test this.