I used to have problems firing guns in my dreams. I could never squeeze the trigger, even if it was a life-or-death scenario.
I went to the firing range for the first time about two years ago and shot about 100 rounds with a friend. Ever since then, I can blow away the baddies in my dreams.
I've found that if I take aspirin or ibuprofen before I go to sleep, my dreams are a lot more vivid and detailed than normal. It also works if I wear one of those Breathe-rite strips on my nose. I guess it has something to do with increasing the flow of blood and/or oxygen to my brain.
"I prefer books and movies where the conflict isn't of the extreme cannibal apocalypse variety I guess." Redsfaithful