This application seems to stop mouse wheel scroll acceleration from working.
Microsoft mouse drivers support mouse wheel scroll acceleration moving the mouse wheel quickly makes it move much farther than slowly. Most apps support this and its extremely useful, this app seems to be ignoring the acceleration so no matter how fast move wheel it moves the same amount based on how far the mouse wheel is moved not on how fast it is moved.
The likely scenario is that when you receive a mouse event for wheel up or wheel down you are ignoring the 'clickcount' field in the event when deciding how far to move. By ignoring this all wheel up or down events are the same default step size.

You can do mouse wheel scroll acceleraion with out microsoft drivers on windows using autohotkey and script that adjusts the clickcount field in events as per this thread http://www.autohotkey.com/board/topic/48426-accelerated-scrolling-script/

Ive run into a number of apps over the last few years that ignore it, and several have been fixed when i contacted authors about it.