Re: beginning-of-measure padding value?

[Kieren MacMillan]

Hi, Graham!

> http://code.google.com/p/lilypond/issues/detail?id=242
> was reported with .12, but it's still present in .21.

On that page, HW talks about "average-spacing-wishes".
That sounds like something in which I (and other 'Ponderers) might be  
interested -- where is this setting documented?

Thanks!
Kieren.