How do you make translucent brushes not overlapp eachother?

Hi,

I wanna paint on 1 layer with different opacity. So i use the shortcut right mousclick + alt + control (PC), to change the opacity of the brush with a vertical mouse-movement (unchecked "vary round brush hardness based on HUD vertical movement). So i change it fast on my pen, which I use.

But if i am on low opacity and do multiple strokes, which "overlap", i get an additive effect and the color gets darker. So, i need a function, where the density is compared, so it dont overlap the maximum value, which i actualy set.

I saw on other programs, there are functions for this, but couldnt find it in Photoshop, to prevent this overlap.

I am not interessted in creating new layer, for different opacity. Thats not my question. I would like to have this fast way, changing the opacity on 1 layer, so i can layer my drawing with different opacity.
This is good, if i do gesture drawings and use low opacity for basic feel and motion of the figure, higher opacity for anatomical lines and max opacity for muscles.

This is a good way to excercise, instead creating hundrets of layers. The preventing of adding opacity is also great for other things.

Prior, i used shortcut "x", to change between 2 colors, but this is not enough, because i need more layers for the construction and the solution with setting fast the density is great. But there comes the problem with translucent brushes overlapp eachother.