I would say that this is unlikely: you need to be within close proximity to the car and you have to keep the button pressed for a few seconds (at least 3) for anything to happen. Furthermore, as soon as the button is released, the opening/closing stops...
the risk is similar to the car unlocking itself while the remote is in your pocket.
dan i have to disagree with you ,whilst at work a while ago i was working on the forklift truck when the spark came in and asked who the ct belonged to as the windows had been down for ages
so i had pressed the button without knowing ,i was about 60ft away from my car ,when i had it enabled ,lexus did double check with me that i did want it as other customers had complained their windows had come down without them knowing