OP:
Yep, so the frequency response plots won't help you as much as time/energy plots. REW has a number of tools for this, but their own forums are better places to go.
With my own tools there's usually a gated measurement in the mid-high frequencies specifically to remove reflections from the measurement. This lets me measure more or less, how well the direct sound reaches my room, but does nothing to tell me about intelligibility.
This is why we turn to other views like waterfall and decay plots.
Best,
E