ummm, so you wanna make a pickaxe rapidfire? There is no work in that. Pickaxe isn't hard, and there are tons of files at the site.
But, if you really wanna code, you will have to get a 12F683 pic chip (not picaxe) or something.
Then learn ASSEMBLY (I think this is one of the hardest language to learn because it's mostly numbers and moving the numbers...and stuff...).