A solution would be to just convert everyone's current username to their 'Unique ID' and then give players the ability to change their display name either every 6 months or 12 months. The delay between name changes will let players change their display name if they are not satisfied with their current one but still restrict them from changing it constantly (for various reasons).
I'd also suggest changing the ban system as well so an admin just bans a display name and the server software will ban the 'Unique ID' for them instead of some other process which would take too much time if they are, for example, spamming and you want to ban them before they crash the server from lag. Also I suggest doing the same thing with OP commands.
As well as this I suggest adding a command available to all players that lets them check someone's 'Unique ID' so that they can tell if it is really their friend or not.
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Optifine works for me, not sure why you're having problems. But if issues with Optifine persist you can use Spoutcraft which has built in HD texture rendering as well as optimisations which speed your game up. You can choose between the recommended build which is 1.2.5 and the developmental build is 1.3.2
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I like your analogy
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I downloaded it and found numerous issues :/
Colour inconsistency (Also applies to stone)
Weird artifact
1) Clump of pebbles 2) Light line
Top half is darker and shifted to the left
Colour inconsistency
Also the stone + bedrock look like the coloured pencil filter in Photoshop :/
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I like it.
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The second, it has an obviously repeating pattern.
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I have a feeling you may need to recreate the whole facial area; it doesn't look right.
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Yummy.