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Currently an attribute that does some of what you are requesting is available, the ItemID attribute, which is not displayed by default. It is an auto-incrementing system attribute which can be displayed, searched and exported.
You enable display of this attribute at Tools | Options | Attributes <tab>, checking the ItemID checkbox, and clicking OK.
The ItemID attribute is not editable and will never contain a letter sequence, but is guaranteed to be unique (to the .urd file) and growing (numbers can be missing from the "sequence" if items are deleted once a larger ItemID has been assigned).
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