> I would be careful with WCETT, according to my knowlegde it is not
> isometric,
Isotonic.
> so it's not stable with a dijkstra minimal cost routing.
There is a branch of Babel (which doesn't use Dijkstra) that implements
something pretty close to WCETT. Please see
http://mid.gmane.org/87hbl8a0ng.fsf@pirx.pps.jussieu.fr
for more information.
Juliusz