Its Fastpath mode on ADSL but won't be an option for all connection types. Latency under 50ms isn't too much of an issue in modern games though lower is always better. I actually find I play better with low levels of interleaving on (the extra confirmations you mentioned) which results in around 30ms ping as its more consistant even if its not always the lowest latency - but usually opt for fastpath.
Fastpath that's the one
Done wonders for me