Symmetrical ties in TieColumn

[Karol Majewski]

Hi

Currently I'm making some experiments with ties.

What I need is a function that makes all ties in TieColumn have the same length 
(see attachment). I tried to achieve this by changing some values from 
Tie.details, but couldn't find the right configuration.

Then I tried to modify shapeTieColumn.ly 
(http://lists.gnu.org/archive/html/lilypond-devel/2012-06/msg00285.html) but 
that's probably not the way it should be done.

My question: how difficult would be to write such function?

tie.png
Description: PNG image