工作解决方案：

(function(){

    var special = jQuery.event.special,
        uid1 = 'D' + (+new Date()),
        uid2 = 'D' + (+new Date() + 1);

    jQuery.event.special.focus = {
        setup: function() {
            var _self = this,
                handler = function(e) {
                    e = jQuery.event.fix(e);
                    e.type = 'focus';
                    if (_self === document) {
                        jQuery.event.handle.call(_self, e);
                    }
                };

            jQuery(this).data(uid1, handler);

            if (_self === document) {
                /* Must be live() */
                if (_self.addEventListener) {
                    _self.addEventListener('focus', handler, true);
                } else {
                    _self.attachEvent('onfocusin', handler);
                }
            } else {
                return false;
            }

        },
        teardown: function() {
            var handler = jQuery(this).data(uid1);
            if (this === document) {
                if (this.removeEventListener) {
                    this.removeEventListener('focus', handler, true);
                } else {
                    this.detachEvent('onfocusin', handler);
                }
            }
        }
    };

    jQuery.event.special.blur = {
        setup: function() {
            var _self = this,
                handler = function(e) {
                    e = jQuery.event.fix(e);
                    e.type = 'blur';
                    if (_self === document) {
                        jQuery.event.handle.call(_self, e);
                    }
                };

            jQuery(this).data(uid2, handler);

            if (_self === document) {
                /* Must be live() */
                if (_self.addEventListener) {
                    _self.addEventListener('blur', handler, true);
                } else {
                    _self.attachEvent('onfocusout', handler);
                }
            } else {
                return false;
            }

        },
        teardown: function() {
            var handler = jQuery(this).data(uid2);
            if (this === document) {
                if (this.removeEventListener) {
                    this.removeEventListener('blur', handler, true);
                } else {
                    this.detachEvent('onfocusout', handler);
                }
            }
        }
    };

})();

在IE / FF / Chrome中测试过。应该完全按照你的预期工作。

Tested in IE/FF/Chrome. Should work exactly as you intended.

更新：拆解现在正在工作。

UPDATE: Teardowns now work.