It will be a nice feature to have more control for the landing pads, what the game need is to have the choise to be able to choose witch landing pad colonist, merchant and visitor comes. In that way you can plan accordly how to make the raiders, visitors and merchand are dealt with!
My reasone is that is almost impossible to not get a traffic jam. Plus the airlocks desperatly NEEDS a 2 way entrance or a way to set the airlock one way ONLY! I had 75 colonist and robots trying to get i and out 3 airlocks and it took ages to do that! PLEASE!!!