Uhmm, I'm not sure what kind of use case I had in mind then...
But for example by having something like
set_bot_destination("foo")
wait(sometime)
set_bot_destination("bar")
wait(sometime)
set_bot_destination("qux")

we could imitate complexe pathgfinding or simuare one npc "visiting" another one
and then walking back to the original waypoint (whereas this very example would
be easier to do with some  has_npc_reached_label?(bla) function)