gistfile1.txt

iD.ui.PresetList = function(context) {

...

        function keydown() {
            // hack to let delete shortcut work when search is autofocused
            if (search.property('value').length === 0 &&
                (d3.event.keyCode === d3.keybinding.keyCodes['⌫'] ||
                 d3.event.keyCode === d3.keybinding.keyCodes['⌦'])) {
                d3.event.preventDefault();
                d3.event.stopPropagation();
                iD.operations.Delete([id], context)();
        } else if (search.property('value').length === 0 && // How to go about adding the equivalent of this?
                (d3.event.ctrlKey || d3.event.metaKey) &&
                d3.event.keyCode === d3.keybinding.keyCodes.B) {
                d3.event.preventDefault();
                d3.event.stopPropagation();            
        } else if (search.property('value').length === 0 &&
                (d3.event.ctrlKey || d3.event.metaKey) &&
                d3.event.keyCode === d3.keybinding.keyCodes.z) {
                d3.event.preventDefault();
                d3.event.stopPropagation();
                context.undo();
            } else if (!d3.event.ctrlKey && !d3.event.metaKey) {
                d3.select(this).on('keydown', null);
            }
        }

...

}

The following works to bypass autofocus. It adds the keybinding to both the document and the autofocused input field. However, only when the autofocused field (document.getElementsByClassName('preset-search-input')[0]) exists on the page. The input added to the page after first instance of "Select feature type" menu appears, which is after drawing a new entity on the map.

var kb =
    d3.
    keybinding('osm_browser_tool_tags').
    on(
        iD.ui.cmd('⌘' + hk),
        bToolChangeTags
    )
// Exists.
d3.select(document).call(kb);

// Does not exist yet. Add an eventListener?
d3.select(document.getElementsByClassName('preset-search-input')[0]).call(kb);