[AutoTrace (convert raster image to vector)]

I could really use an Auto Trace feature in Designer.  I hand draw pretty complicated illustrations which clients often want to have as a vector so they can be scaled up to be big vinyl installation murals.  It's kept me bound to using Illustrator as I can't find a third party software that converts the bitmap line art in the way I want.  I need to have the black lines traced AND the white areas so that they can be selected and coloured in Designer.  In Illustrator I select Live Trace then make and expand to do this.  I've tried Inkscape but unless I'm missing something, can't find a way of doing it.  I just get the black line art converted and the white areas change to transparent and can't select and colour them.  It's driving me a bit mad TBH.

I've included a typical illustration here as an example of the bitmap line work and the results I'm after.