> (BTW... Do you know of any real modellers that do? I realise theoretically 
> somebody could make such a thing, but do you know of any real programs 
> that do this?)

http://en.wikipedia.org/wiki/Parametric_feature_based_modeler

The property you're after is "paremetric modelling", where instead of only 
being able to assign numerical dimensions, you can apply rules and formulae 
based on any other dimensions.  Commonly you can do things like "make sure 
this face remains parallel to this one", or "make this radius half of this 
dimension" etc.  Then of course when you change one thing, everything else 
updates.

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