I also recommend checking out this plugin that I wrote:https://github.com/SublimeText/Origami
It makes it easy to make arbitrary pane layouts.
Don't forget to stay up to date with the dev builds!
There are keyboard shortcuts to move files to different pane numbers, but no shortcuts to move them, say, right a pane. I don't think doing this is actually possible at the moment, because while you can set arbitrary layouts I believe there's still no way to read back what the current layout is.
If you check out your Main.sublime-menu you can see how the layouts are actually created.
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