> Has somebody invented a way of placing points in 3D space even though you 
> only have a 2D edit area yet?

Most 3D modellers I've seen allow you to split the edit area into 4, 3 
viewing orthogonally along each axis, and 1 perspective.  This allows you to 
place points accurately in 3D, and of course check the "real" look of the 
outcome interactively (yes all views update together in real-time).

Like this:

http://www.nycresistor.com/wp-content/uploads/2009/07/blender-20080613-095701.jpg

Alternatively you just have 1 perspective view and slide the point along 
each axis as you see fit (obviously rotating the model whilst you're doing 
it to check the look).

Depends on personal preference I guess, and what exactly you're modelling.

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