Feature Request: Brush Opacity Adjust On Canvas

[Somerset]

I would prefer another key for this, I think. At first because it would replace the brush size function. And also because it could collide with the function to draw straight lines in a locked angle (Cmd+Shift).

Edit: One additional annotation: In ArtRage in fact only a few tools really have a feature for brush transparency as f.e. in Photoshop or Affinity Photo. That is because ArtRage is more oriented on simulating analog painting than image editing softwares do. While f.e. the Airbrush has a Transparency slider, other tools create transparency with Thinners and/or the Pressure in a different way. It's a little more complex as in image editing softwares, I think.