How to continue event propagation after cancelling?

Below are the bits from the code that actually worked in Chrome 13, to my surprise.

function handler (evt ) {
    var t = evt.target;
    ...
    setTimeout( function() {
        t.dispatchEvent( evt )
    }, 1000);
    return false;
}

This is not very cross-browser, and maybe will be fixed in future, because it feels like security risk, imho.

And i don’t know what happens, if you cancel event propagation.