postion of accidentals in Chords (cluster-like)

[Nikolai Zinke]

Hello,

I've been using your wonderful lilypond (2.1.6) on my OS X 10.2.8 for a 
few weeks...
Due to my interests in writing modern, atonal music with something 
special harmonic situations
I recognized , that the positioning of accidentals in a chord is a 
little incorrect:

I type the chord:
(Therefore I prefer setting always accidentals at least  in this 
piece... )

 <cis'! a'! ais'! b'! c''! >4.


(
but in automatic mode:

<cis' a' ais' b' c''>4.

it's even that  the "a"-accidental is  completely overwritten by "ais",
so you don't know there's an "a")
)

I'ts near by a cluster-chord
There appears a problem after rendering:
the accidentals stay on the same place if the notes are on the same 
line/between the same line;
they should placed next to each other.

Even better :
A  famous way of notation Bartok used is
(it's a suggestion or possible solution) to implement a notation, you
divide the stem into two stems : if  two notes in a chord are put on 
the same line/between the same line are
now written with two little (like a branch of a tree) short stems!
It would'nt be any more confusal.
A musician can now read it very quickly as the correct chord ...

Thanks for considering a solution for that "little" problem;

best regards,
Niko