[Mauzen]

pawn Код:

stock ShowScoreBoardForPlayer(playerid)
{
    SendClientMessage(playerid, 0xFF0000FF, "Please press TAB now!");
}
stock ShowScoreBoardForAll()
{
    SendClientMessageToAll(0xFF0000FF, "Please press TAB now!");
} 
//same code for hide

Should work

There is no way to script this yet, maybe it will be added in future versions.