Issue Description:
When trying to page the application launcher via use of a touchpad scroll, it is almost impossible to scroll just one page. This appears to be because the scroll is reliant on "one click" of a mouse wheel or similar.

Unfortunately because touchpads provide such a small surface area, it is rather difficult to accurately scroll just *one click*. The problem is exacerbated  the smaller a touchpad is and the more pages there are in the application launcher.

Proposed Solution:
There are a few solutions possible for this;

1: Make scrolling proportional reliant on a user defined number of "scroll lines" - meaning, the user has to scroll their touchpad a certain amount before the page changes.

2: Scroll by icon row - this may be more intuitive to use, and also retain the current behaviour somewhat. The behaviour being that the user scrolls *one click* and the application launcher scrolls one row per scroll *click*.

3: Implement free-scrolling, basically the same behaviour as seen when using an application folder within the launcher.

Options 2-3 may be much easier to implement, with option 2 possibly being the more natural behaviour a user would expect when using a mouse wheel. Option 3 may feel more natural when using a touchpad, and is how an Android device scrolls, depending on the launcher used.

The ideal solution would be to have an option for page/row/free scrolling - perhaps available as a right-click context menu when right-clicking a blank spot within the launcher.