Mouse problems with touchpad on Acer Aspire R5-471T

I've installed Ubuntu 14.04. Initially I couldn't use the touchpad at all (fortunately, there's a touchscreen, but it's usually less easy," but I found an option in BIOS that I changed from "Advanced" to "Basic" on a hunch and then was able to use the touchpad again.

1) I can't enable two-finger scrolling. It doesn't appear in my options. I tried adding a line to /etc/X11/xorg.conf (which I created for this purpose, based on this), but it hasn't changed anything yet.

2) Clicks seem to go missing. At times I want to shift focus from one window to another and it takes several clicks to get the system's attention.

What can I do about these things?