In fact Breitkopf's new Bach edition has somewhat more generous spacing that
doesn't require a tweak.
Overriding LilyPond's very clever spacing algorithm is a dark art to me. I'm
having to do a lot of it right now, but my approach is unashamedly hacky - but
it works for me! Anyway, my totally hacky solution (which I'm sure will get
blown away shortly) is extremely simple: turn the first crotchet in the pedals
into two notes, but secretly - that changes the spacing just enough.
pedal = \relative c {\global c1~ | c4*1/2 s8 c4 h a | gis2 gis' | }
c4*1/2 draws a crotchet, but only uses a quaver of time; the other quaver is
filled by s8 (I tried a hidden real quaver first, but that took too much
space), and the other parts move over a little to match.
Paul
