Tier 3 Boots?
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I think the boots are fine where they are at. If you were to do this idea, the other boots would need something to make them better choices as well. Not sure if this would be good for game health or not. /shrug.
would be an interesting concept. they wouldn't be able to give any more movement speed though, as Rito has said that was part of the reason they got rid of enchants. More defensive/offensive stats would certainly be nice though. something like adding ap to sorc shoes, old distortion on boots of lucidity, standard 45 movement speed in combat for boots of mobility, and reducing the duration of slows as well instead of just the intensity for boots of swiftness
It's certainly an interesting idea at least.