Settings
CMSMS 1.10.3+Formbuilder 0.7.2+Code impaired Site admin(me)
Scenario
Formbuilder form non-inline with datepicker and tipsy enabled (gonna post it on tips & tricks I promise)
About 14 or 15 fields regular textbox (FROM Name email, email again, a datepicker and few dropdown boxes)
3 Dispositions:
*Validate using email
*Save to formbrowser(not that I need it but recquired to make validate using email work as i read in forums)
*Send result to email.
What's the problem?
Everything works fine, the client (person who fills in the form) receives the email with the link that validates is a real person. And once clicks on it, the user reception department receives an email. But when the reception department clicks REPLY on the mail client, the mail is being replied to the account I created for the formbuilder.
It didn't happen before when the main email field was a FROM EMAIL ADDRESS field and I was able to choose how to populate the reply-to header in the send to mail disposition. It changed when I replaced the FROM EMAIL ADDRESS field with the validate using EMAIL.
I'm aware is a disposition field and should not be in the middle of the form.
What I've tried to solve it and got no results
Created again a FROM EMAIL ADDRESS field so I can change the Reply-to header (I do not want to use it as FROM header neither and get in trouble for relaying mail)
Now I want to duplicate the value from one email field to the other (type email twice to confirm email for a client is ok, but 3 times is weirdo

Tried hacking the form template to achieve it (is already a custom template), but realized (thanks to the people at irc chat) that variables at form template are basically read-only.
Searched each and every entry on the forum on how to pass variables from another module to FB, from FB to other module, even from one form to another form. I've created UDTs using sessions, capturing, assigning vars, but don't know HOW TO USE THEM and assign it to another field on same form once the data are collected.
I understand it should be done somewhere after the form templates is submitted, the client follows the link on his/her email (It's supposed that this disposition prevents all other dispositions to work) and before the reception department receives the email.
Also tried cheating with jscript but not very enthusiastic to client-side approach, I mean, the form is surrendered to scripting settings in the browser.
If someone can please clarify me with a more specific approach to what I'm trying to achieve. Is it possible? Am I asking too much?
I mean is not mandatory for the form being successfull but I think gives a touch of comforbaility to a reception department that still receives those form via phone/fax and will make me easier to train them and that the find it useful (yup them still swear for a good ol' fax and sewed notebook booking system) if i can save them that little step and really let them answer the reservations just one click away.
Thanks for reading this long post and for your suggestions. And many thanks to all that have helped me in these days trough the IRC channel
Will