Setting spawn location of specific players when offline

First things first, I tried searching for this specific issue, but the insane amount of spawn-related questions makes it about impossible to find what I need. I know how regular players can set their spawn point. I know how to set the main server spawn point. I know how to set a spawn point per world. My problem is not there.

How can I set an offline player's position to X Y Z so that he'll appear at that spot the next time he logs in? If he's online, I can /tp him here; that obviously won't work with players not currently on the server.

Additionally, how do I make it so that this new position (again, specific to a single player) will be their new spawn point if they happen to die while playing?

I've been hesistating to ask this not to face a wall of "rtfm n00b" posts, but this is a use case I haven't seen before, so any help is appreciated. Thanks!

 

http://forums.bukkit.org/threads/you-need-help-we-need-this-information-to-help-you.2018/

I believe you can change a users spawn location using mcedit. Not 100% sure though.

 

The hell does any of this have to do with his problem? That thread is if someone has errors. This guy is searching for a plugin or some way to do what he is asking.