Yuniar,
I think this feature request was also made recently by orware and seconded by williamansley in another post, but i think this feature deserves its own string...
We've been using MachForm for a number of years now. The one thing we've always wanted is the ability to require LDAP (or CAS) authentication to fill out a form. Also, the ability to pull the user's LDAP attributes into the form data, like name, username, email, etc. This would allow us to verify the form is being filled out by a specific user, that user is part of our organization, and auto-fill user data about that person.