Matt - just wanted you to know that this has been included in the latest release issued last week. Set HourlyNBMQPF to True in the ForecastBuilderConfig file.
Be aware that if you do use hourly QPF and your neighbors do not, in can create some issues for your neighbors in viewing the QPF in ISC. Offices in Eastern Region somewhat get around this by having QPF6hr, SnowAmt6hr and IceAccum6hr grids. However, this does not work for offices neighboring them in CR/SR.