Is it possible (or is there any tool) to control mouse scroll speed with modifier keys in Windows?

There is a setting to set how many lines to scroll when you use your mouse wheel. That's OK and I know how to change it. But in some apps I need a finer control, say I want to scroll one line with each step. I just wonder if there's a way to control that, e.g. hold alt key to scroll one line (instead of the 3 lines set in control panel).