Raster to Vector functionality question (v 1.4.0b)

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Raster to Vector functionality question (v 1.4.0b)

Greetings.  We are using the "Vectorizer" tool to convert a raster of flood water height (similar to a topo map) to a shape file.  

Our goal is to produce a single shape file containing polygons per flood level at 1 foot (.305 meter) increments.

Is there a way within the vectorizer tool to specify the setting "pValue" (the value to use to trace the polygons) so that multiple threshold values will be converted and included into a single shape file?  

At this time it seems we can only convert one threshold value at a time (which results in separate shape files per threshold).  

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