Here’s a quick tip, to change the mouse speed using command-line under X, use the "xset" command.
xset mouse 38/10 2 # I use this setting on my 1920x1200 LCD.
You can of course get more information by the usual "man xset" command.
And yes, xset does more – things like turning the display off, setting the keyboard LEDs, keyboard autorepeat settings etc… – check the manual out!
Here’s what I use to turn my screen off – assign that to a hotkey / command and voila, you now have a virtual "off" button for your LCD!:
xset -display :0 dpms force off