Ok, I just sent this suggestion:
"In the timeline, the audio waveform is hardly visible if a clip is selected (bad colors/contrast when highlighted). It even gets worse, if you select the audio clip/track itself.
That's why I suggest to add an option to change colors or to make the highlighted color a darker grey.
Currently, the colors are $6E6E6E (video clip selected) and $828282 (audio clip selected). I changed them to $101010 and $202020 and I think it looks much better."