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The current import patch needs work to be of practical use to web services-- it does a scan of the entire blockchain to find transactions to the newly imported key (and keeps the wallet locked that entire time). For any sweep/import solution to be useful for more than once-in-a-blue-moon use, an index of pubkeys to transactions involving those keys should be kept.
It seems to me the "sweep now, and re-sweep every once-in-a-while" functionality would work nicely for web services. Can you describe a use case that wouldn't work?