[Exolent[jNr]]

#include < amxmodx >
#include < orpheu >
#include < orpheu_stocks >
#include < hlsdk_const >

new OrpheuStruct:g_ppmove;

public plugin_init( )
{
    OrpheuRegisterHook( OrpheuGetDLLFunction( "pfnPM_Move", "PM_Move" ), "PM_Move" );
    OrpheuRegisterHook( OrpheuGetFunction( "PM_Jump" ), "PM_Jump" );
    OrpheuRegisterHook( OrpheuGetFunction( "PM_Duck" ), "PM_Duck" );
}

public PM_Move( OrpheuStruct:ppmove, server )
{
    g_ppmove = ppmove;
}

public PM_Jump( )
{
    new iPlayer = OrpheuGetStructMember( g_ppmove, "player_index" ) + 1;
    
    if( is_user_alive( iPlayer ) )
    {
        OrpheuSetStructMember( g_ppmove, "oldbuttons", OrpheuGetStructMember( g_ppmove, "oldbuttons" ) | IN_JUMP );
    }
}

public PM_Duck( )
{
    new iPlayer = OrpheuGetStructMember( g_ppmove, "player_index" ) + 1;
    
    if( is_user_alive( iPlayer ) )
    {
        new OrpheuStruct:cmd = OrpheuStruct:OrpheuGetStructMember( g_ppmove, "cmd" );
        OrpheuSetStructMember( cmd, "buttons", OrpheuGetStructMember( cmd, "buttons" ) & ~IN_DUCK );
    }
}

Requires Orpheu and the PM Functions pack.