I second this idea.  I currently use an IsTest variable for my more complex
scenes to control draft/final renders.

My method uses true and false as opposed to custom variables.

#declare IsTest = [true/false]
#declare ObjTest = [true/false]
#declare TexTest = [true/false]

#declare UseObj = ( IsTest & ObjTest ? RealObj : StubObj )
#declare UseTex = ( IsTest & TexTest ? RealTex : StubTex )

object { UseObj texture { UseTex } }

I differ from Jerry only in that Draft=true and Final=false.

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