I've been hearing that Keymailer is going to get some new and exciting products onto Keymailer. While you can't use the same account for both gaming and publishing, you can sign up as a Publisher. To do this, please follow the below steps:
1) Go to the main page
2) In the top right hand corner, below where it says "Sign-up", select the option which says "GAMES PUBLISHERS - START HERE"
3) Follow the instructions to sign-up as a publisher
Hope this helps!