Hi,
Yes, it seems a very good system, and indeed the built in path finding of unity doesn't seem like the most flexible system out there, tho from the communication I had with the unity developers, they do plan on improving it, like having 3d path finding ( for birds, planes, etc) and dynamic navmesh, but when and whether its going to happen is still speculation
Personally, I would enjoy writing the custom actions around that, but realistically, it will not happen before Unite, end of august. So Maybe someone can step in and provide some custom actions to start with.
Bye,
Jean