I found a temporary fix (clients are pushing me to launch this soon).
Changed this
$("#fieldlist"+identifier+" .pb"+page).find(".field")[0].focus();
to this…
$("#fieldlist"+identifier+" .pb"+page).find(".field")[0]();
and…
if( !/date/.test( el.id ) ) el.focus();
to this…
if( !/date/.test( el.id ) ) el();