Gravity Form script

Hi! I need a Gravity form of Wordpress to show a drop-down list of existing users in the database so when I choose one user from that list the form submission will be done in the name of that user. There is someone that already worked on a solution here: [login to view URL] I need to be able to implement it on a gravity form of mine. The wordpress is private so the users are always going to be logged-in when using this form. Budget: 10usd Once you give me the script and I test it on my server, I will release milestone. NO ftp o enviroment is going to be given, the developer should use his own wordpress. i can send GF plugin.