flatten ties ~ proportional notation.

[Rob Canning]

hello,

i would like to replace ties between notes with a line connecting note 
heads. i'm not sure how to go about this. should i try and flatten the 
curve of the tie, make it slightly thicker and change its relative 
possition to the notehead or is there a better way.
is there some sort of global override i can do to change all ties to 
this style.

this is what i have so far:

\override Tie #'line-thickness = #3
\override Tie #'control-points = #'((0 . 0) (0 . 0) (0 . 0) (6 . 0))

but this makes all the ties the same length centered on the middle line 
of the stave.

i would like lilypond to control these elements and just override the 
curve of the tie.. i would like to do this on a global level as the 
score is being generated algorithmicaly and trying to do it on an 
override-once level would be too messy.

any ideas?

many thanks

rob