Since it apparently is "best practice" to use the form module to for all kinds of user interaction one should be able to pre-fill form fields when displaying the form. A perfect example to illustrate this need is the stkPURUpdateForm paragraph which allows the user to update info about his/her user account. The form however is displayed empty. One can create a custom form engine and a form step state which sets the values in the fields, but you cannot add this manually created form state to the form engine (no setter method and private formState attribute). So either a setter method should be provided or then we should have an additional "formValuesInit" method which takes a hash with the values and does the rest.