Have you discovered the "threshold" settings? (Tools->Options->Name Tags). I found that dropping the "Suggestion Threshold" down to 70 gave a pretty decent correct match::false match ratio that reduced some of the manual tagging without adding too much manual work of fixing wrong matches. Lower than that started to return too many false positives.
Dropping the "Cluster Threshold" below 85 started to screw up the grouping of faces to a degree that was leading to too many incorrectly tagged names, so I wouldn't go lower than that.
You haven't found a keyboard shortcut for the "Add Person Manually" button have you?
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-TJ
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