I notice that the applications don't stay straight when you add more on. Is there a way to fix this? Can you also speed up the scrolling speed when on the unity launcher?
If you don't mind installing a PPA, you may consider Drawers. There's a nice video by quidsup on Drawers along with installation instructions and a more recent video, also by quidsup, in which Drawers gets a mention: http://youtu.be/3jZTTp8nefw?t=4m29s at the time specified in the link. And version 13.2 has a review here.
The image (stolen from quidsup's video) shows a couple of browsers stacked horizontally. (Apologies if reproducing it here is a violation in any manner.)
Caveat: I have no personal experience of Drawers.
As far as speeding up scrolling goes, it may be an issue of resources and may be related to the "special effects" enabled. If you have limited resources, in terms of, for example, CPU, GPU, or RAM, you could try disabling some of the visual effects associated with the Launcher. Many of them are described here in the section appropriate to your version.