Sourcing - unable to decrease close date time within 3 hours

When the following Controls are set in a negotiation ("Buyer may close the negotiation before the Close Date" and "Buyer may manually extend the negotiation while it is open") -- Buyers are allowed to manually extend or close the negotiation. However, users are still unable to lessen the Close Date time to within 3 hours before the current close time. This does not make sense as some negotiations (e.g. auctions) may need to have time lessened to within 3 hours before the existing close time, and the Buyer is allowed to close immediately (even within the 3 hour window.)

This functionality is strange because the Buyer can still extend the auction (and thus extend the auction a couple of hours and THEN reduce the auction time as a workaround) and close the auction immediately, but they cannot enter in a new close date that is within 3 hours before the current close date.