It'd be nice to see Reference give users the ability to precisely dial in the gain level instead of it jumping by 0.4 dB increments. Many VST plugins allow musicians this kind of knob/slider control by holding down the Ctrl, Shift, or Alt key while adjusting. Maybe something like that, or just the option to double-click the number and type in a value, could be added.
I found a way to get the dB level exactly where I want it, but that involves turning on Safe Headroom, turning down the Dry/Wet mix, moving the Gain slider above where I want it, then pushing the Dry/Wet up until the Gain moves down to the desired level. Clearly, this is a pain in the ass, and implementing what I mentioned earlier would help.