[DeathOnaStick]

Well I would try it like this:

pawn Код:

public OnPlayerCommandText(playerid, cmdtext){
    if(!strcmp("/logout", cmdtext, true)){
        return OnPlayerCommandText(playerid, "/q");
    }
    return 0;
}

This is the most elegant way I can imagine, just dunno if it works how I expect.

If /q is a command in itself then it will work, but I fear that /q is embedded in the samp application itself.

Let me know if it worked.