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ZBrush/Vue workflow HLP

ZBrush Usage Questions
#1

Hi all,
I am quite new to Zbrush, and need some advise PLS
I am doing Terrains for my game engine.
I have a few questions : (for Zbrush)

  1. Is there a way to constrain, displacement to the Up(Y) axis.
  2. Is there a way to use a heightMap/ Alpha to displace a Plane accurately
    ie (1:1) (Alpha:Plane)

I have been setting the alpha to my heightmap, and doing DragRect ZAdd over a Plane
This is a bit random, and I would like to get the same result each time I do this.

I would like to complete my workflow between, Vue and Zbrush

Any Ideas/Techniques would be gr8ly appreciated
(I am not afraid of scripting)