Berti
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The quantizer gain has an influence on the transfer functions (NTF/STF). Unfortunately, the gain of a 1bit quantizer isn't well defined. But usually you derive you filter coefficients assuming that the quantizer gain is equal one. After dynamic-range scaling you quantizer gain will probably change. In order to have the proper STF (equals 1 in your case), the direct feed-forward path times the quantizer gain should be one. But I cannot predict from scratch how the loop stability is influenced in your case. Of course, without the input signal feedforward you get a well designed feedforward modulator, while with the input signal feedforward you STF with probably even amplify the input signal.
I hope that helps, Regards.
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