Currently it's possible to add a Waypoint to something by Alt+RightClick on the thing if one has TomTom installed.

I think the TomTom syntax is /way 34.43 43.34 or similar.

A similar thing can be achieved with Zygor with a similar syntax of /zygor way 34.43 43.34.

Requesting Alt+RightClick to add a waypoint with Zygor if TomTom is not found.