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That's correct, multi-value attributes do not support this in Endeca.
If you're looking to do it, I would keep writing your updates to the multi-value attribute (to maintain the functionality that depends on this attribute and its multiple values) and also write it to a separate single-value that is constantly being updated, rather than appended to.
One attribute called MyValueMulti as a multi-assign.
One attribute called MyValueLatest as a single-assign.