If you do a Low Frequency response measurement on ETF with the long measurement time selected and export the data you should end up with either 0.67Hz or 0.37Hz (approx) resolution in the exported data - you need to use a higher gate time to get the greater resolution, 600ms or above, though this may be too high for smaller rooms or measurements with poor signal-to-noise. Would pretty much always expect to be using at least 300ms, however.
Room EQ Wizard will eventually have the option for logarithmically swept sine measurements, probably a 5 or a 10s sweep, but that is some months away.
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