It shouldn't make any difference if you have to wait 1 minute or 10 before you take a penalty.
If Owen wants the responsibility he needs to practice. When he slotting home 100 percent in practice, then he can be given a go.
Otherwise, let Murphy or Hamann take them.
I would suspect Owen said he'd take it. Hyypia is Captain and should have Houllier's wishes for who takes pens as instruction before the match. Then Sami should take charge. If it's Owen, then fine. If not, then he should pull Owen back.
Owen will get his goals. We all know that.
Besides we got 3 points. They don't award 6 for style.