My http://play.elevatorsaga.com/ solution

elevatorsaga.js

{
    init: function(elevators, floors) { 
        console.log('elev:' + elevators.length + ' flrs:'+floors.length);
        elevators.forEach(function(elevator,index){
            elevator.on("idle", function() {
                console.log(index + " the devil's plaything");
                var idleFloor = [0,0,0,0,0,7,0,0,0,0];
                goToFloorSafe(elevator,idleFloor[index]);
                elevator.goingUpIndicator(true);
                elevator.goingDownIndicator(true);
            });
            elevator.on("floor_button_pressed", function(floorNum) {
                if(goToFloorSafe(elevator,floorNum)){
                    var goingUp = elevator.destinationQueue[0] > elevator.currentFloor();
                    elevator.destinationQueue.sort(); //lowest floor next
                    var safety = floors.length;
                    if(goingUp) {
                        //we're headed up, lowest floor is next in queue.  Make it so lowest floor above is next
                        while(elevator.destinationQueue[0] < elevator.currentFloor() && safety) {
                            frontToBack(elevator.destinationQueue);
                            safety--;
                        }
                    } else { 
                        elevator.destinationQueue.reverse();
                        //headed down, highest floor is next in queue, make it so highest floor lower than current is next
                        while(elevator.destinationQueue[0] > elevator.currentFloor() && safety) {
                            frontToBack(elevator.destinationQueue);
                            safety--;
                        }
                    } 
                } else { console.log(index + ' already headed to '+ floorNum);}
                if(_.uniq(elevator.destinationQueue).length != elevator.destinationQueue.length) {
                    console.log(index + ':'+elevator.currentFloor()+' q:'+elevator.destinationQueue);
                    console.log(elevator);
                }
                elevator.checkDestinationQueue();
            });
            elevator.on("stopped_at_floor", function(floorNum){
                var nextFloor = elevator.destinationQueue[0];

                if(elevator.destinationQueue.length == 0 || elevator.loadFactor() == 0) {
                    elevator.goingUpIndicator(true);
                    elevator.goingDownIndicator(true);
                }
                else if(nextFloor > floorNum){
                    elevator.goingUpIndicator(true);
                    elevator.goingDownIndicator(false);
                } else {
                    elevator.goingUpIndicator(false);
                    elevator.goingDownIndicator(true);
                }
                
            });
            elevator.on("passing_floor",function(floorNum,direction){
                var headedThereAnyways = elevator.destinationQueue.indexOf(floorNum);
                if(!floors[floorNum]) {console.log('WHHHAAAATTTT FLOOR '+floorNum); console.log(floors); return;} //this was happening for some reason
                var goingRequestedDirection = floors[floorNum].buttonStates[direction];
                if( (headedThereAnyways > 0) && goingRequestedDirection) {
                    //queue out of order.  This elevator was going to stop at this floor anyways but not the next stop
                    console.log(index+ ' before splice:'+ elevator.destinationQueue + ' floorNum:'+floorNum);
                    elevator.destinationQueue.splice(headedThereAnyways,1);
                    elevator.destinationQueue.unshift(floorNum);
                    console.log(index+ ' after splice:' + elevator.destinationQueue);
                    elevator.checkDestinationQueue();
                } else if(headedThereAnyways == -1 && goingRequestedDirection && elevator.loadFactor() < .5 ) {
                    console.log('watch out for hop ons');
                    //we have room to pick up someone and we're headed in the direction they want to go and we weren't right about to stop at that floor anyways
                    elevator.destinationQueue.unshift(floorNum);
                    elevator.checkDestinationQueue();
                }
            });
        });
        
        function leastFull(goingUp) {
            var sameDirection = elevators.filter(function(elev){ return goingUp? elev.velocityY > 0 : elev.velocityY < 0});
            if(sameDirection.length == 0) sameDirection = elevators.slice();
            return sameDirection.sort(function(a,b){return a.loadFactor() - b.loadFactor()})[0]; //switch to most full for fewer moves and greater wait time
        };
        
        function frontToBack(arr){
         arr.push(arr.shift());
        };
        
        floors.forEach(function(floor,index){
          floor.on("up_button_pressed", function(event) { 
            goToFloorSafe(leastFull(true),index);
          });
          floor.on("down_button_pressed", function(event) { 
            goToFloorSafe(leastFull(false),index);
          });

        });
        
        function goToFloorSafe(el, floorNum){
            if(el.destinationQueue.indexOf(floorNum) == -1 ) {
                el.goToFloor(floorNum);
                return true;
            } else {
                return false;
            }
        }
    },
    update: function(dt, elevators, floors) {
        // We normally don't need to do anything here
    }
}

Level 17 stats:

Level	17
Transported	1997
Elapsed time	1006s
Transported/s	1.99
Avg waiting time	7.6s
Max waiting time	36.5s
Moves	8770