So I've been using Lilli's JumpSlowDown_enable for a while now but it feels a little different to the cod 4 style one so I decided to get that one. I think it needs host and should work for all clients as well.
jump_slowDownEnable Speed 0x004161FD -> default: 0x75 on: 0x74 //Disables the speed slowdown when landing
jump_slowDownEnable Friction 0x0041623A -> default: 0x75 on: 0x74 //Disables the friction change when landing
jump_slowDownEnable Height 0x00416328 -> default: 0x74 on: 0x75 //Disables the jump height restriction on consecutive jumps
also some other jump related ones
jump_height 0x007E0AA0 default: 39 //self explanetory
jump_stepHeight 007E0A60 default: 18 //Lets you walk up walls and shit if you set it really high
bg_fallDamageMinHeight: default 128 //Prevents fall damage from any value below it