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SendStringToExecute will do exactly what you want you just need to give it the right information. In your example above you are only telling it the drawing to insert. You did not give it the scale factor or the rotation information.
so your SendStringToExecute line.
doc.sendstringtoexecute("._insert c:\test.dxf" , false, false, false)
would become something like this.
doc.sendstringtoexecute("._insert c:\test.dxf 1 0" , false, false, false)