This feature request comes as a development of the functionality to the stock compressor.
Here is the idea - when we add a stock compressor we bring down the Threshold so that the peaks of the audio are reduced and we see a visual representation of the threshold level within the plugin.
What i am requesting is the ability for the Threshold level to be displayed horizontally across the audio waveform in the main arrangement view. That way you can visualise where the threshold is and you can see the peaks that cross and cross the threshold.
Ive attached a mock up to help you visualise my request
In the above example you can see the light green horizontal line which is the compressor threshold level, and you'll see audio passing over that threshold.
You may be asking, "what if i use 2 compressors, one for peaks and the other for the RMS level in series?" then the second compressor threshold indicator could be a different colour to represent the other compressor.