I found a way to register my steam RoTMG account to a email. Now I can play on steam or web browser/flash player. Unfortunately I can not post links to the guides I used because they are not from this website. However, I can tell you the guide is on reddit. IT STILL WORKS AS I USED IT A MONTH AGO. You basically download a old client for the game, before Kabam disabled the linking steam accounts to web browser. This version of the client will let you link a steam account to an email address. If you are not careful you will delete your account though. So to avoid this make sure to click LINK STEAM TO EMAIL ADDRESS. not the other option labeled LINK EMAIL ACCOUNT TO STEAM. This option will delete your steam account forever! I think I still have the old client version, Just not sure if I can upload it to here.