Background info:
In crossFire the bhop(Bunny hop) is used to either prevent sounds of moving (to stop other players tracking you) or to remain invisible in ghost mode.
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There's no point, if you're versing a decent player the bhop script is going to throw you of more than it is for them.
To them you're just a playermodel that has a varying height, but at one point it's consistent the whole time unless you're strafing.
Also, if it's spamming the spacebar (Jump), that'd be the shittiest and most unreliable method ever as you become extremely inaccurate when in the air, unless in low gravity maps.
It'd be wiser to spam the Crouch key or spam strafe for about half a metre just enough to move the head out of the way, but not enough to move you're aim that far as to be unable to fix it with a short flick.
It wouldn't be that hard either, and an injectable DLL is extremely stupid and would take it over the top. All you need is something like a keyboard hook (I'm not sure at all, if you discover a hook, tell me.). Most programming languages would be capable of this, even something like java or pascal would probably be able to make this.
The only way i'd use the "bhop" script is if it was headshot mode or at a far range. otherwise, it's pretty much pointless as it's more damaging to you than it is to them. If you have decent skills, it's easier to just pop a few shots and get a kill or hs.
IDEA: the auto crouch script (bhop i suppose) should work of crouching and be on a random algorithm/timing so it's not predictable, but still be fast enough to put the other player off. If i was the enemy and i saw a pattern (within 2 crouches) i'd just aim up and pop 2 shots and kill you.
If you need any help with the program, feel free to PM me or ask me with anything.
I'm fairly knowledgeable in a few languages (Mainly VB).