In Preferences -> Evaluation there is a menu to change "Format type of new input cells" and the only options available are: StandardForm, TraditionalForm, and Raw InputForm.
Is it possible to set this to InputForm?
Edit: This is V9.
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In version 7
InputForm appears in the drop-down list. You can apply the same setting using:
Whether that has the desired effect in recent versions I do not know.