After the Light Blues' Scottish Cup semi-final clash with St Johnstone in April finished 1-1 at the end of extra time, the former Cardiff keeper saved spot-kicks from both Steven Milne and Jody Morris to put Rangers into the final, where they will meet Queen of the South.
And his save from Fiorentina's Fabio Liverani in the UEFA Cup semi-final penalty shoot-out earlier this month helped the Govan club reach their first European final in 36 years.
The 30-year-old said: "It has already entered my head and obviously saving a penalty to win the cup would be the best thing in my career.
"It would be an unbelievable experience for me - and would make me very popular with the Rangers fans.
"In fact it would be fantastic for everyone associated with the club.
"When it comes to penalties, it's a bit of a lottery and it can go either way.
"I've been lucky since I've been at Rangers and I just hope it continues.
"I don't want to give too much away on my penalty-saving technique but I usually study the run-up.
"Maybe we will do a little bit of studying before the game to see if it can give us a clue but I think it will just be about what happens on the night."
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