Does the first point in the Wiki still hold true? Seems like too easy of a workaround.
Have an upcoming trip you want to cancel and redeposit the miles -- but subject to the 30 day or less cancel fee?
Just use the free change to move to a flight further in the future (>31 days) not subject to the cancellation fee and then cancel / redeposit for free.
Note the change does not need to be to the same itin or the same mileage cost. If the change is to a cheaper mileage ticket, the extra miles will be redeposited for free.