If it works for you go ahead... but something is wrong with your dishwasher or you're using the wrong mode (eco) then. This is absolutely not the correct way to use a dishwasher.
The pre-wash cycle is the shortest cycle and by using all of your soap in the beginning you are spending the majority of the wash cycle without soap.
Cameras at a charging station are obvious - the wire in those stations are extremely valuable. Or, vandalism.