not sure why you'd need that, presumably you want to DE? if you have it on group loot then just click disenchant on the master? I guess if you really hate group loot this wouldn't work.
There is also an autoroll addon called passloot that can take some of the annoyance out of looting. You could simply set everyone else to ignore blues they cannot use and the specific toon to greed/de on them.
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