This is useful for users with laptop computer which have touch-pad instead of mouse.

Usage:
Hold Trigger-key(this key can be changed. default is SHIFT).
Move MOUSE. Page scrolls the direction.
Release Trigger-key. Scroll speed will be fixed.
To stop scroll fire Trigger-key.
(In Mac)
To stop scroll fire SHIFT, COMMAND or OPTION regardless of Trigger-key config.

Config:
Trigger-key is SHIFT key by default.
Select it from CTRL, SHIFT or ALT.
You can set CTRL and SHIFT.
Can't set only ALT.
(In Mac)
Command is instead of CTRL and Option is instead of ALT.
Can't use CTRL key.