[[ABK]Antonio]

Yes, it is possible.

pawn Код:

new bool:InClassSelection[MAX_PLAYERS] = false; //outside of everything


CMD:changeclass(playerid, params[])
{
    if(!InClassSelection[playerid])
    {
        InClassSelection[playerid] = true;
        SetPlayerHealth(playerid, 0);
    }
    else return SendClientMessage(playerid, 0xCC0000AA, "You're already in the class selection!");
    return 1;
}

public OnPlayerSpawn(playerid)
{
    if(InClassSelection[playerid])
    {
        //set their camera pos etc.
    }
    else
    {
        //everything else on OnPlayerSpawn
    }
}

I couldn't get my class selection working because I was having problems with getting the left and right arrow keys...Don't know why they were messing up, maybe you'll have better luck.