addlyrics vs. lyricsto

[Nancho Alvarez]

Hello! I have been playing around with the development version of lilypond.
The improved lyrics support is lovely, specially the new way of 
rendering hyphens.
I have seen that \addlyrics is not  longer documented, and that there is 
a new way
to link notes and text, \lyricsto. The behaviour of both is different.

I attach an example.
With lyricsto (upper staff) the alignment looks  centered on the note. 
This is nice if the notes are not part of a melisma, but in my opinion,
in the melismas, the text should be centered at the left, because 
usually there is a lot of room to the right of the note.

With addlyrics (down staff) the melisma is very nicely aligned but it 
seems that the last sylabe would be nicer if it would be centered.


This difference of behaviour is  a bug or a feature?

Thank you in advance
                                             NANCHO

\version "2.1.23"
#(set-global-staff-size 16)

\header{}

melody=\notes{ g'8 \melisma a' b'  c'' \melismaEnd c''2 }
text=\lyrics{ssssssssssssssoft -- ware }

\score{
<<

\context Voice = soprano \melody
\lyricsto soprano \new Lyrics \text

\addlyrics
\context Voice = "v2" \melody
\new Lyrics \text

>>
\paper { raggedright = ##t }
}