Keep the screen lit, dim the rest ...

Hi,

I am very happy with my bold 9900. I found a realy nice clock for bedside use (Free Musical Clock - Multi Alarms Free - Download Musical Clock - Multi Alarms Free - Free Apps from BlackBerry App World) wich has the option to leave the screen lit while charging. This doesn't work. Everything dims as usual.

When I use an external app (eg BBlight), I can keep the screen lit, but the keypad is lit as well. This is too bright for bedside use.

My question : how can I leave the screen lit, but dim all the rest while charging ?

Thx in advance !