We used to have a rule to adjust V1 to VMCg if it was below. In the NG it is not a case that i've seen ever happen as the VMCg is usually below 100kts at a sufficient low derate and the lowest V1 i have seen so far was 104kts.
Nowadays the boeing software takes care of the whole issue and we only get the three speeds, but no clue as to how close we are to VMCg, only that we know that it allways checks V1 against VMCg and keeps us safe. The company therefore removed the VMCg tables from the QRH as we do not need it anymore.
Just one thing. VMCg is only fixed for a thrust setting, since thrust settings are not fixed though it is another value that can be played with.