You should bind your joystick to "collective (analog)", not "collective". It would solve this problem. And by the way there's already million tickets about this same problem. There is a search function present here, you know.

http://forums.bistudio.com/showthread.php?152312-Jump-MF-basic-mod-to-unlock-vaulting-animation

"Hey, sun should blind you, when you're looking at it."
"No, stupid, it shouldn't - look at this beautiful photoshoped photograph of sea sunset!"
"Okay, conversation over."

The main thing that is wrong with crosshairs is that I don't use 'em. Maximum realizm FTW!!! =)