No idea, sorry, I got the NextPage/PreviousPage from the power test scripts.
And I'm not familiar enough with the Linux event input interface to know if you could somehow get the correct code by shutting down the framework (or whatever actually grabs the event device), and listening to it yourself.
Also not sure if the keyCode reported in the logs when using ;debugOn would actually help:
Code:
D TextField:DebugInfo::KEY:java.awt.event.KeyEvent[KEY_PRESSED,keyCode=16,keyChar='',modifiers=Shift,extModifiers=Shift] on com.lab126.mario.DisplayServiceImpl$1[null]
(That's supposed to be a SHIFT keypress).