MAX Auto Jump Code.
client.cpp
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void CL_CreateMove (float frametime, struct usercmd_s *usercmd, int active)
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 //auto jump
 if (usercmd->buttons&IN_FORWARD && me.alive && cvar.autojump)
 {
  if (me.pmVelocity[0]==0 && me.pmVelocity[1]==0  && me.pmVelocity[2]==0 )
  {
   usercmd->buttons |= IN_JUMP;
  }

 }