[Lorenc_]

Whats the point of using sscanf for such simple thing?

pawn Code:

new bool:tagset = false;
CMD:togglenametags(playerid, params[])
{
    new ID = strval(params);
    if(!IsPlayerAdmin(playerid)) return 0;
    if(isnull(params)) return 0;
    if(tagset == true) tagset = false, ToggleNameTags(0), SendClientMessage(playerid, -1, "Unset");
    if(!IsNumeric(params)) return 0; // You may need this func
    if(ID > 1 || < 0) return 0;
    ToggleNameTags(ID);
    tagset = true;
    SendClientMessage(playerid, -1, "set");
    return 1;
}

Untested, though should work I suppose