[Finn]

pawn Code:

new bool:beenspectating[MAX_PLAYERS];

forward spawnplayer(playerid);
public spawnplayer(playerid)
{
    beenspectating[playerid] = true;

    ForceClassSelection(playerid);
    TogglePlayerSpectating(playerid, 0);

    SpawnPlayer(playerid);
    return 1;
}

public OnPlayerConnect(playerid)
{
    beenspectating[playerid] = false;
    return 1;
}

public OnPlayerRequestClass(playerid, classid)
{
    if(beenspectating[playerid])
    {
        return 1;
    }
    else
    {
        SpawnPlayer(playerid);
        TogglePlayerSpectating(playerid, 1);

        // SetPlayerCameraPos, SetPlayerCameraLookAt, etc.

        SetTimerEx("spawnplayer", 5000, false, "i", playerid);
        return 0;
    }
}

Should work. I scripted that in very short time so it might have bugs. I tested if it works, and it did.