A few more ideas for keyboard shortcuts, stolen from my markup plugin.

Some of these were pinched from the RTE, but others didn't make it into Confluence 3.2 or 3.3:

    var hotkeys = {
        "Ctrl+B": "bold",
        "Ctrl+I": "italic",
        "Ctrl+U": "underline",
        "Ctrl+-": "strikethrough",
        "Ctrl+=": "subscript",
        "Ctrl+Shift+=": "superscript",
        "Ctrl+Shift+8": "bulleted-list",
        "Ctrl+Shift+3": "numbered-list",
        "Tab": "indent",
        "Shift+Tab": "outdent",
        "Ctrl+'": "quote"
    };

Two more that are specified elsewhere:

• Ctrl+' for blockquote
• Ctrl+1, 2, 3 for headings

In general, the shortcuts line up with either Microsoft Word or wiki markup (e.g. Ctrl+* for bullet points)

I think different keyboard layouts (e.g. European) might mean different ways of the same character has a different keycode. Something I didn't get far in testing yet.