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I liked this feature in vindictus, where you could just hammer your face against a boss with infinite revives untill you got the pattern down, but it only really works in vindictus because you can solo up to dungeon bosses to actually learn their patterns. It's really unlikely to get a group to willingly go into a practice mode.
I definitely like the idea of learning a new dungeon with a group of random people but it's just not realistic for a dungeon/boss that's been available for a while.
Cape Westwind is the perfect example. Nobody runs it except people who are new to it but just need it to advance the story. Result is insane wait times.
Practice mode would turn out the same way.
Your best hope is to hit DF when a new dungeon is first released and then everyone will be derping for a few days until people start memorizing it to the grind.