TupletNumber direction

[Daniel Rosen]

\version "2.16.0" \times 2/3 { c'8 c' c' }

Is there a way to get the TupletNumber to show up on the note head side instead 
of the beam side? Seems to me that this would be a pretty common tweak, and I 
can't find it in the manuals or the LSR or anywhere in the list archives.

DR