[lwhi]

I'm sure APIs would be implemented which would provide games developers with programmatic 'knobs' for fine-tuning.

[smallblacksun]

The problem is that the fine tuning only works for one particular situation. In a game, it has to work for every situation the user can create.

[eru]

Then just don't bother with manual fine tuning. Level designers are using object libraries even now, where they just take a pre-made chair, instead of constructing them out of basic polygons every time.