2 custom layouts for Sublime Text 2: – 2 rows + 1 column & 1 column + 2 rows – Place in packages/user/ as Main.sublime-menu

gistfile1.json

[{
"id": "view",
"children": [{
    "id": "layout",
    "children": [{
        "command": "set_layout",
        "caption" : "Custom: 1 Pane (1C 2R)",
        "keys": ["super+alt+shift+5"],
        "args":
        {
            "cols": [0.0, 0.5, 1.0],
            "rows": [0.0, 0.5, 1.0],
            "cells":
            [
                [0, 0, 1, 2], [1, 0, 2, 1],
                              [1, 1, 2, 2]
            ]
        }
    },
    {
        "command": "set_layout",
        "caption" : "Custom: 2 Pane (2R 1C)",
        "keys": ["super+alt+shift+6"],
        "args":
        {
            "cols": [0.0, 0.5, 1.0],
            "rows": [0.0, 0.5, 1.0],
            "cells":
            [
                [0, 0, 1, 1], [1, 0, 2, 2],
                [0, 1, 1, 2]
            ]
        }
    },
    {
        "command": "set_layout",
        "caption" : "Custom: 3 Pane (2R 1C 1C)",
        "keys": ["super+alt+shift+7"],
        "args":
        {
            "cols": [0.0, 0.44, 0.72, 1.0],
            "rows": [0.0, 0.5, 1.0],
            "cells":
            [
                [0, 0, 1, 1],
                [0, 1, 1, 2],
                [1, 0, 2, 2],
                [2, 0, 3, 2]
            ]
        }
    },
    {
        "command": "set_layout",
        "caption" : "Custom: 4 Pane (2T 1B)",
        "mnemonic": "C",
        "args": {
            "cols": [0.0, 0.5, 1.0],
            "rows": [0.0, 0.5, 1.0],
            "cells": [
                [0, 0, 1, 1],
                [1, 0, 2, 1],
                [0, 1, 2, 2]
            ]
        }
    },
    {
        "command": "set_layout",
        "caption" : "Custom: 5 Pane (1T 2B)",
        "mnemonic": "C",
        "args": {
            "cols": [0.0, 0.5, 1.0],
            "rows": [0.0, 0.5, 1.0],
            "cells": [
                [0, 0, 2, 1],
                [0, 1, 1, 2],
                [1, 1, 2, 2]
            ]
        }
    }]
}]}]

Updated with more custom panes