Potential patch for 'tap' synthetic event's notifier custom event to allow e.preventDefault() or e.stopPropagation() to have that effect on the subsequent 'click' event.

gistfile1.js

notifier.handle.evt.fire = function (e) {
  var subs = this._subscribers.concat(this._afters),
      args = Y.Array(arguments, 0, true),
      i, len, halt;
      
  for (i = 0, len = subs.length; i < len; ++i) {
    halt = subs[i].notify(args, this);
    
    // stopImmediatePropagation
    if (halt === false || e.stopped > 1) {
      break;
    }
  }
  
  if (e.prevented || e.stopped) {
    e.target.once('click', function (clickEvt) {
      e.prevented && clickEvt.preventDefault();
      e.stopped && clickEvt[e.stopped === 2 ? 'stopImmediatePropagation' : 'stopPropagation']();
    })
  }
  
  return !!this.stopped;
};