Often when I browse the current novels on this site I add novels to my library that seems good but of which I know I will not read them any time soon (due to not enough chapters released etc) but would like to keep them listed somewhere for whenever I feel like it's time to start with a new novel.
This has as effect that my library has become quite chaotic and i get notifications about chapter update every moment of the day, mostly for chapters that I am not even gonna read.
A 'to read'-list would solve this and then you would only get notifications for the novels that you are actually reading.
An other solution would be to enable toggling notifications on every novel individually but that would most probably be more coding work then just add an extra list.
Cheers