Hi there,
First thing that came into my mind was, that you just select all pushpins (rectangle around alle pushpins

), then make a right click and then click left on "add pushpins as waypoints" or something like that.
I'll check on the other thing, but I guess, to add adresses directly as waypoint is not that simple, unless you use a script to do so.
Greetings,
Syd