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REW only makes one calculation of the response, when multiple sweeps it pre-averages synchronously in the time domain before FFT so coherence would be 1. Frequency domain averaging is on the list to be looked at though, and I'll take note of the other items. What settings would you like captured in the presets?
 

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One minor request....when using the loopback feature, would it be possible for the ETC and impulse to show absolute time?
It is certainly possible, are you aiming to compare arrival times between different measurements, e.g. to check speaker or drive unit time alignments?

A feature I have already included is an option to eliminate measurement delays through a process of cross correlation of the captured impulse with its minimum phase counterpart, that has the effect of finding the zero time of the system itself and eliminates all the time delays, whether in the soundcard path or the system itself.
 
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