Don’t get point 1. You can set and see exact values for both pre and post effect gains in Mixer view and in the respective devices in the DSP chain.
EDIT2: Actually you mean level, not gain, isn’t it. Where can you see this for Master, as you claim you can? Not seem a numerical representation of output level from what I remember. Could be nice to have some more options for the meters in general. Peak-hold, PPM style (still with dB but the fast attack/slow release is important) and RMS options would be nice, with numerical data for each as well as the graph.
Point 2. Search the suggestions forums. Some quite nice ideas for expanding the spectrum are logged in a thread in there.
EDIT: Think this is the Spectrum thread I was referring to: