However, this doesn't cover all the bases, especially the ones where nobody gives a voice command. OTOH, the handle doesn't appear to be a convenient selector for complex orders such as "as close to Cabin 7G221 as possible" or "Deck 16, forward port station". Perhaps the system is smarter than we give it credit for? Perhaps the turbolifts run on regular, predictable routes like a bus, unless you specify a destination, and the handles are for activating or overriding the bus functionality.
I always figured that the turbolifts automatically took one to the the most direct course, based onthe information given. For example, if one says, "deck 5," the lift would stop at the closest lift station on deck 5 from where it started - taking into account maneuvering around other lift cars and such (which I still insist share shafts. At least some of the shafts could be made for larger traffic.) However, if you say "sickbay," or "transporter room 4," or "Dr. Noel's quarters", it will take you to the closest station to that location.