In that case then the FA (or FIFA/UEFA) should bring in video technology for doubtful penalty calls - similar to what they have in rugby and cricket. If those 2 sports can cope (and accept the decisions as they do without question!) then there's no reason football can't do the same.
I'm hoping that 'Arry will change the team for the replay at Elland Road - please NOT Jenas and maybe Pavy from the start instead of Crouch. If Lennon isn't fit then maybe a combination of Hutton at RM and Corluka at RB could work? Just my opinion of course ;-)