Hidden sliders for all numerical inputs (for example blend factor)

Hi,

It would be nice if, for example, instead of having to cumbersomely type in numerical values for the blend factor, a hidden slider function allowed you to quickly try out different values. I could imagine the user clicking on the numerical value, holding down the mouse button, and moving the mouse to the left or right to decrease or increase the numerical value.

I understand that there isn't room for large visible sliders everywhere, which is why hidden sliders would be a practical addition.

Best-
Micha