bitlord: Currently, there is no /etc/sddm.conf by default. It's used only to override internal settings that can be listed by using "sddm --example-config" or "man sddm.conf". And sorry, the section is [Autologin]... We can discuss this on my mail (firstname.lastname@example.org or email@example.com) or IRC if you will, this is horribly messy.
orion: I'll look into the logout issue tomorrow with a machine with selinux. Right now on a machine without it, it's fine. bitlord: Config structure has changed, you have to add a "User=" key into a [Auto] section. See sddm --example-config to list every option and section available.