I'm missing 2 shortcuts to increase/decrease the color value, step-wise by 10%. useful if you get used to this shortcut. Eventually you could add also shortcuts to increase/decrease the color saturation, always stepwise by 10%.
these already exist? Darker/Lighter is on K and L by default, the rest needs hotkeys configured for them in settings->configure Krita->shortcuts, and the strength can be configured in settings->configure Krita->color selector setting->hotkey And if if they don't do what you want, you can create actions with python that do do what you want quite easily.