Auction Automatic Extensions

Hi guru

I create an auction with end at 17.00 and I have Settings for Automatic Extensions:

Inactivity Period: 10 min.

Extension Duration: 10 min.

Now if a bid is received during the inactivity period (for exemple at 16.55) the system extends the auction for 10 min to 17.00 (so new end auction is 17.10).

I want to add the Extension Duration 10 min not at end period (17.00) but to time of last received bidder ( 16.55). SO NEW END AUCTION 17.05.

Is it possible????