I'm not sure you understand the idea of accounts and roles. You are, normally, 'user'. To do anything as the 'root' user, you need to issue a command that allows other commands (like the 'mv' command or even a shell that you can perform multiple commands in). The idea that toggling developer mode does something that you described as 'gives you root' sounds odd. What I imagine it probably does is disable the ability to be able to issue commands as the root user--hence, turning on developer mode simple permits a sudoers privilege that lets the 'user' go ahead and issue things like 'su' or 'sudo' to be able to issue root access commands.

Also, I have to agree with the previous post that said that you should probably wait until there's a flasher and image available. There's no point in bricking your device already. I would hope that there's plenty of hacky snacky stuff you can already do without needing to root it.