Do you mean that would like when
placing a new waypoint on the map,
that it automatically gets the name of the nearest road or map
element?
This is
reverse
geocoding and it is not performed by the routing engines.
It can be done by the selected search engine (with snap of
coordinates).
To test it, use the "Show address" in Cruiser (long press or right
click).
You will see that depending on the selected search engine,
the result will be a blue icon *not* at the pressed point, but
*near*,
(where the engine finds a result).
Note that this needs internet and causes load on the search engines.