Is there any way to modify a path manually?

I am want to take finer control of the shape of my Ai's paths but I see absolutely no way to modify a generated path or construct a new one with my own corners. Does anyone know of a work around that I am not seeing?

 

One way to do it (albeit a cheesy one, perhaps) is to just create your own node system... and use the NavMesh logic to move some agent along the path by feeding it the first node. Once close enough to the first node, it picks the second node and generates a path, and so on. I used this idea once for a patrol route AI.