Only chargers I've seen that do this are the Hyperion Duo3 and the 0720iNet3 as described on the Hyperion charger support page - "Note that v3.2 firmware for NET and DUO add a Terminal Voltage Control setting (TVC), intended ONLY for expert users and racers, completely at their own risk, which allows LIPO and LIFE packs to be charged in excess of recommended cell terminal voltages."
You can find a link to the manual here -
http://media.hyperion.hk/dn/eos/
In my experience, their service has been great, only have had on prob and the dealer sent me a new charger without waiting on my returning the defective one.