PowerBright 1.0 (updated)

v1.0:
- More efficient method of hold detection: now holding 'Power' works at startups too.
- Users can now choose the hardware button to hold: choosing other button than 'Power' was reported to solve the no-effect issue under LD/TX.
- v0.8 added menu option for backlight/brightness: when reporting 'no-effect', please tell me if the menu's min/max brightness worked for you.

現在可以設定 power button 以外的鍵，所以 Treo650 應該也可用了