I'd like to request the addition of a "reverb volume pseudo-object". Like trigger volumes, these are abstractions to represent where to compute and apply reverb in a scene. Everything outside these hand-placed volumes would not have computed reverb.
Naturally, if a scene contains no reverb volumes and the user chooses to enable reverb in the scene, the whole scene would be computed for reverb, like now.
I would also propose that the reverb for the whole scene and for each discrete reverb volume would have one or more sliders to adjust for the degree and other characteristics of the reverb effect, such as decay rate and delay.