grace/appoggiatura slur problem

[David Bobroff]

This may not be considered a bug, but it produces non-optimal output:

\version "2.5.24"

\score {
  \relative c {
    \clef F
    r4 \appoggiatura {a16-[ b c-]} d4 d,8 r \grace {a'16-[-( b c-]} d4-)
    d,8 r \grace {a'16-[-( b c-]-)} d4 d,8 r r4
  }
}

The \appoggiatura creates a slur but it is attached to the head of the
first appoggiatura note and the stem of the main note.  The slur slopes
down while the notes go up.  If I try to work around it by using \grace
and putting in the slurs "by hand" I still get the same output.  If I
include only the grace notes in the slur it looks ok, but isn't exactly
what I wanted.  I would like the slur to be attached to the head of the
first grace note and the head of the main note.  I can use \slurUp and
it puts the slur on top and it's better than having it go the opposite
direction that the notes are going, but it looks a bit odd to me (maybe
because the score I'm working from has the slurs down in these cases).

Can \appoggiatura be made smart enough to always slope in the same
direction as the notes?

Is there a plan to re-introduce tweakable slur attachment?

-David