I'm so used to hitting CTRL+ALT+t to start up a terminal, here's how to do it in knoppix 9.1.

Go to Preferences/CompizConfig Settings Manager then click on General / Commands, set command line 1 to "terminator" (don't type the quotes) then go to Key Bindings and set "Run command 1" to Control Alt t by clicking on the "disable button" (because it's disabled by default) and then click on "grab key combination" and type Control Alt t and then click on OK.

Now Control Alt t should load terminator.