The workaround is easy though, and can be accomplished by using the command syndaemon:
syndaemon -d -i 1This disable the touchpad while typing on the keyboard, and will enable it again 1 second after the last key has been pressed. The -d option makes the command run as a daemon.
If you only want to disable tapping and scrolling (but not the mouse movements) when you type, just add the -t option:
syndaemon -d -t -i 1To avoid having to type the command every time you logon, simply put the command above as a new entry in System > Preferences > Startup Applications