i can't understand why you would want them to leave a laptop on the front door. i mean do you leave your cars unlocked with the keys inside on the streets? i realize that you must trust your community but the risk vs rewards is completely not worth it.
It all depends on the driver. The guy that runs my route at home usually leaves stuff right by my front(side) door if I leave him a note. However for my laptop when it comes (soon I hope) I'll most likely pick it up at the terminal which is about 4 blocks from where I work.