I exclusively use the level 2 block list for maximum protection and speed. This breaks a few sites, but for me it's less than 5% of the sites I visit. However if a site breaks I currently can only choose between continue using level 2 block list or none at all. I propose the following:
Standard protection -> Level 1 block list
Strict protection -> Level 2 block list
Under the "Enhanced tracking protection" add another switch between "Standard" and "Strict" (So between level 1 and level 2 block lists). You know, when pressing that cute little blue shield in the address bar. And finally add a drop down per site under managing exceptions in settings.
This way I can choose between three levels of protection per site, none, standard & strict.