Supporting it natively has been suggested before, but it's not something the admins are likely to implement in the near future. Try using the Reddit Enhancemen

Supporting it natively has been suggested before, but it's not something the admins are likely to implement in the near future. Try using the Reddit Enhancement Suite plug-in to easily switch between accounts (unless you are force into IE at work). Also, note that r/ideasfortheadmins is the better place to post ideas like this (and the admins do read it and respond to it).