Hmmm... I hadn't realised you can graduate the train brake with the mouse.
I'm kind of fine with the keyboard controls. Initial if I want to slow down gently, full if need to slow down sharpish. I can get by with that just fine.
I'd probably use the mouse to control the loco brake since you need to look down to see where it's at, anyway.
I'll certainly give it a shot with the train brake to see what it's like.
But yeah, I'm not sure you can moderate it with the keyboard, but happy to be told different. 😊