EDIT: The program has been updated from version 188.8.131.52 to version 1.01. Changes include:
-Keys now follow the screen orientation, even when rotated.
-OK + red phone key = toggle radio (ie, turn phone on and off)
-OK + C = toggle bluetooth
-OK + Enter key = toggle wifi
-Windows + * key = toggle keyboard backlight
-Windows + # key = turn off screen (does NOT put device to sleep! wifi will still be on, programs will still run, etc.)
gudong over at PDAClan has just written a program that allows you to use the number pad on the 614 as a D-pad. It works like this: hold down the end call button for 1 second, and the red LED will light up to let you know it's working. When it's on, the number pad keys have the following functions:
1：Home 2: Up 3: Page up
4: Left 5: Enter 6: Right
7: End 8: Down 9: Page Down
To switch back, just hold down the end call key again.
Also, you can change the backlight by holding down the Windows key and a number:
win + 7: 1st level of screen brightness, with the keyboard backlight off. Good for using indoors in average lighting.
win + 8: 2nd level of screen brightness, also with keyboard backlight off. Good for bright rooms and outdoors.
win + 9: Brightest level (use when in direct sunlight)
win + 0: Lowest brightness level, keyboard backlight on. Good for dark rooms and nighttime.