Thank you very much - it works phantastic!
Here some code I change, maybe useful for other user. 
I edit the convert.js file, so that the meshing UI popup and I can choose specific parameters:
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function Convert(FileName)
{
    var gd = moi.geometryDatabase;
    // Open the file, set 2nd param to true to suppress any save changes prompt.
    gd.open( FileName, true );
    // Create the output file name by breaking off the file extension and adding 'obj'.
    
    OBJFileName = FileName.substr( 0, FileName.lastIndexOf('.') + 1 ) + 'obj';
    // Save out to the output file, passing the option to suppress the UI. You
    // add other options separated by semi-colons with no spaces. These
    // options are available for controlling the meshing:
    // NoUI=true
    // Angle=12.0
    // Output=ngons | quads | triangles
    // MaxLength=0.0
    // MaxLengthApplyTo=curved | planes | all
    // MinLength=0.01
    // AspectRatio=0.0
    // Weld=true
    // Display=shadedwithedges | shadednoedges | wireframe
    // ExpandedDialog=false
    gd.saveAs( OBJFileName, 'Angle=12.0;MinLength=0.01;MaxLength=1000;AspectRatio=20;Weld=true;Output=quads');
    // Let's clear out and suppress any save changes prompt again.
    gd.fileNew( true );
}
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My Rhino button scripts are:
_-export "d:\temp\moi.3dm" _enter _enter
_-run "C:\Program Files (x86)\MOI 2.0\LaunchMoIBatchConvert.cmd"
_delete
_-import "d:\temp\moi.obj" _enter
The second button script delete the NURBS object and place the mesh at the same place. Here a simple button image to make it complete.
For quick meshing I create an automatic button, that doe's all this without meshing UI. 

The modified scripts are attached and here the button script:
_-export "d:\temp\moi.3dm" _enter _enter
_-run "C:\Program Files (x86)\MOI 2.0\LaunchMoIAutoConvert.cmd"
_delete
_-import "d:\temp\moi.obj" _enter
There is a problem with the automatic button - the moi.obj is imported before the meshing is finished. I think, it could be good to add a command or switch, so that the script wait until the meshing is finished. I would like to avoid a wait command with a fixed time. Anybody has an idea? ;)