Hi,
Better late than never...
The
administrator can edit User Input Fields default values without modifying the PSM document by going to
Settings Menu->Production->Input Fields defaults and create (or edit) a user input field that is associated with a specific form.
But I believe the user you are talking about might be more like a Customer than an administrator? For example, you would like a user placing the same order several times not having to re-input its data (via user input fields) each time.
I cannot simply tell you it's impossible because anything is possible when you are a programmer
But to my knowledge, it's not built in the product.
Benoit