Automatic beaming in polymetric (scaled) context

[Urs Liska]

Hi,

if I use \scaleDurations to create polymetric music like written in

http://www.lilypond.org/doc/v2.18/Documentation/notation/displaying-rhythms.html#polymetric-notation

there is no automatic beaming, see:

{
  \time 9/8
  c8 c c c c c c c c
  \time 4/4
  \set Staff.timeSignatureFraction = 9/8
  \scaleDurations 8/9 {
    c8 c c c c c c c c
  }
}

Is that really right or is there a possibility to make that example work 
like a "real" 9/8 time signature?

Best
Urs