I have two suggestions for future releases. The first is to allow setting a timed location report so that you can send out your current location periodically without having to go through all the steps again. I would add another option to the send location final panel next to the 'send' that let you flag it as something to be done periodically.
The second is to allow wazers to see the posted speed for the road you are on somewhere. Of course, that would have to be take judiciously since waze should not be used in fighting a speeding violation. And such a feature comes with all the usual update/currency issues, but it would be like the gas price feature in concept.