Sale agent selection at checkout page

Hello, this is a very nice plugin. I would like to buy premium version. I need to have agent selection option in checkout page. This will help us to provide bonus to the sales agent based on their performance. I want to implement this feature for inhouse product sale where I protect a product category from normal website visitors. But only sales agent who have password (protected pages)for their page that contains few private products. Please let me know if I can show the agent selection on checkout page. Thank you.