Hi,

It does not seem to work, unless I'm missing something.
I'd like to be able to draw a curve in freehand mode. Right now I have to place each point individually.

i dont think it is possible yet, however, you can place more points by selecting the curve and clicking on it while holding shift (shift + LMB)

You're not missing anything. Freehand is not currently supported in the Unity plugin. We might add it in the future but no promises at the moment.