In fact on second thoughts, this would make a nice enhancement to future releases, a few more out of the box properties for users. At least then you could make the Contact Tech Support form's email field be read only and read in the value of ??USER.EMAIL_ADDRESS?? or something along those lines.
this should be fine, you can even make it a required property and force people to fill it in when you create the user.
file the enhancement w/ support.