Hi Francois!
I drew you a picture (top). Just a couple of guide lines (parallel to the y-axis 0 line at a user-defined uV) would go along way, as we tend to eyeball it rapidly and make a judgement about how much of a screen has above-threshold waves. I will play with the thresholding thing to see if that's a useful indication as well.
That was so much fun I thought of some other sleep scoring features to illustrate on my sleep scoring wish list. In retrospect, #3 with multiple filters would be my top choice.
https://photos.app.goo.gl/UCaMz1xC5y7yFagA6
Regarding the F6 to jump 30s forward, can there be a jump back version too? We often have to hop about and I keep falling off the 30s jumps and making my stage markers overlap instead of replace each other.
Best regards,
Emily