It wasn't me - I don't even have ships capable of creating/removing warp points (i have the tech, just no desire). And the ships can stay if you want them to, but generally I'm going for a more pro-active approach this game. I tend to be handed my aft section if I turtle...
actualy you can close a warp point that you are not already sitting on, if your sitting on annother *single* warp point - give the move order, then the close order. if the ship is sitting on more than 1 wp then it will ask you for the name and it wont work.