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Well, it should be quite obvious as to who is constantly on the server, that they would be using a little script to keep them connected, and more...
One thing you may need to think about is adding an AFK-kicking timer. At any given time 10-15% or even more of the people playing are just AFK...
Is the 1.3 world going to be set to "large biomes" or default-sized biomes? Large biomes are extremely cool, as long as we spawn in forest or plains!