Polyvinyl alcohol (PVA) support

I bought a two headed printer, largely so that I could print more interesting objects by using polyvinyl alcohol (a water-soluble printable substance) for support. But I'm not seeing any documentation on how to actually do this. Can Skeinforge be talked into generating support material as a second substance printed from the other head?

If not, can someone recommend a different slicer that will, that works well with the Creator Pro?

Jow,

Meshmaker from Autodesk does a good job, has an auto feature or you can place your own supports. I've been using it about a month and so far it works well. It's a nice creative designer as well, more bend pull push manipulation vs cad style.

~3C

makerware offers the choice of extruder to use for support as does simplify3d.