Attatching camera to attatchment point?

Is it possible for me to attatch a camera to a unit, say, on their overhead point?

I don't see why/how that would be possible, but why don't you try.

You could just lock the camera on the unit and then manipulate it so that it appears to be at the overhead point, though.

You'll have troubles with the camera height map when correcting for unit z heights (walking up terrain) since the camera map uses a smoother version of the terrain map (so there is no jerkiness while panning). I did find a work-around though. If you generate your terrain heightmap with terrain deformations on load, the camera height map will be flat and it will not update to the terrain deformations.

See, I was trying to create a first-person unit view camera, so the issue was the z-correction. This can be locked, then.