The difficulty of synching game entrance

[Arnulf]

Ehh, not sure what you mean. What you have is a situation were your character is not at all in the game yet. It is completely the same as if you were not loged in at all, the difference only being that your client is loading nessecary graphics and sound (and whatever else it needs to initiate). From the games perspective (the server) and the other players perspective, you are not in any way there, not processed, not shown, not anything. At most the game has you on a hold and in the status of (here I will insert this new player as soon as I get the "go" signal from the client that it is ready. This as oposed to today, when the server waits for basically the same but at another point, not caring if the client is ready or not.
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Giving the client the means to instruct the server, that something which should be controlled only by the server, is not ready will be abused. Let's think about the invulnerability bubble again. This could be abused for checking, and not getting penalized in any way, what people are doing in the opposing faction towns. This could be abused for checking if Lord Kazzak has spawned, if the four green dragons have spawned, all without the risk of death.

And these are only the most obvious things that come to my mind. There are probably many more devious things.