Being one who used to tinker with Macroquest (the SINFUL PROGRAM NO ONE LIKES), I can honestly say that most of the features that weren't obviously detectable were pretty useless except for the map. Pre-Mid Velious, you were able to see the items on a mob, but since the items are now generated on death, the only thing you can tell now is location and level. That's it. It's essentially a graphical Tracking that doesn't require any special skill to use.
Then there was the ability to instantly change your character's location by screwing with the packet stream, as well as change some characteristics (run speed, etc), but anything that actually alters the stream is VERY easily trackable. It's the sniffers that are more or less impossible to track. The only way you could feasibly track something passive like that is by sending some sort of packet that forces it to identify itself somehow by finding some sort of exploitation in the code.
*shrugs*
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