http://www.gpcarreon.com/?p=221#more-221
"Heres something for WM5 Smartphone users out there. What the tweak will do is to allow you to use keypad buttons to scroll up or down PIE instead of using the joystick/ action button. Thanks to dq366 of MoDaCo for the instructions."
MVP
gpcarreon has posted what I think is the best tip ever. The tip solves my biggest problem: I have QVGA screen + EDGE + pIE on my Smartphone but browsing is still a pain. To scroll the page I have to use the joy stick which is slow.

This tip overcomes the problem by creating keypad shortcuts for page up, page down, page top and page bottom etc.

Thanks
encece, for pointing out this tip. So get your mobile registry editors out and add these settings. Since backup tools are not available, please be careful while modifying the registry. And
gpcarreon has a solution for the Windows Mobile 2003 SE users also, check out the Windows Mobile 2003 SE fix over here.
I added the following KeyMaps on my Smartphone:
Key pad button 2 (Value name: 50) -> Page up (DWORD value: 1)
Key pad button 8 (Value name: 56) -> Page down (DWORD value: 2)
Key pad button 3 (Value name: 51) -> Page top (DWORD value: 3)
Key pad button 9 (Value name: 57) -> Page bottom (DWORD value: 4)
Key pad button 5 (Value name: 53) -> Full screen toggle (DWORD value: 12)
Source: encece