When you aren't regiestered you can jump with 2 (bleh) players and 2 hills.
BUUUUUT, when you register, you can do everything.
Poor idea, what's with pirate keys? And here goes my idea:
Let everyone who register it's game unlock only some part of the game, fe. 10 jumpers, 4 hills (In B-3, if there will be 6) and if you wanna more, you have to check is the key genuine online. (Using an option). Every hacker would be blocked and only few first people could ride on this key full (Untill it's blocked). And now you have to buy the right key.
That would increase selling of the game by... 200%? And the price could go down ^^
Hope you like my idea, I've even made a poll
