When I'm adjusting kerning, I tend to click the glyphs and drag them until they kerning looks correct as opposed to adjusting them with the arrow keys. When glyphs are viewed large (128 or higher), I can get decent accuracy by dragging, right down to the exact number I want. At smaller sizes the increments become more coarse. I change size a lot so often I have trouble nailing a particular number*. I carefully twitch the trackball but, since the slider is based on pixels the numbers jump in increments. It would be a real improvement if these adjustments were not based on pixels but on mouse movement. I don't know if that's possible but if it is, I sure would like it.
* If I'm adjusting visually, why do I need to hit a particular number? I guess I don't
need to but it's what I do. Sometimes I'll have some numbers in my head, like: O kerned to period is -16 . . . U kerned to to period is -8. So when I'm kerning using paragraphs of text, I'll be happily sliding letters together and I'll encounter a J period. I start sliding it and I remember U to period is -8, so I try to slide it to -8 . . . but I can only hit -7 or -9 no matter how steady my trackball movements are.
