I just had this idea while working with water and glass in photoshop. What if the blending modes had a slider (like opacity) that controls the amount of blending mode that effects the layer. This could open the door for so many different possibilities!
yes with another layer that is on normal underneath and then you would have to fix the opacity on that layer too, which works but I was thinking of all of the different possibilities you could make without having to back and forth between tweaking both layers. just something to increase creative workflow and see different options quicker.