Conclusion

[Matthias]

Both of your coding policies examples are wrong.

Code:

stock RegisterPlayerAccount( const sPlayerAccountName[], const sPlayerPassword[])
{
    SendPlayerMessage(playerid, MSG_STYLE_BOX, "You have registered an account.");
    return;
}

How are the variables passed on to that function constant in any way? It should look like this:

Code:

stock registerPlayerAccount (playerAccountName[], playerPassword[])
{
    SendPlayerMessage (playerid, MSG_STYLE_BOX, "You have registered an account.");
    return;
}

And this:

Code:

new bool:bIsPlayerRegisterd;
new iPlayerState;
new sPlayerMessage[128];

Code:

new bool:isPlayerRegistered;
new playerState;
new playerMessage[128];

Should be something like that. Although I still wouldn't know what "playerMessage" would contain.