Display Format setting in Expression Personality Editor

I am trying to create a Personality for the ImageCue mini-media server using the Expression Personality Editor.  I see that I can set a channel's Display Format to Raw which is what I need so that the user has access to all 255 DMX values rather than 100 percentage values.  However, I'm not seeing any way to set that channels value when programming except in percentage.  Can anyone provide some insight here?

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