With Key Mapper you can customize key actions of your P800 / P900 according to your needs and use your smartphone in a more convenient way.
Key Mapper for P900 supports the following actions for keys:
Start application
Close application
Go to previous application
End call
Activate Phone keypad
Lock screen
Activate menu
Escape.
You can have two actions mapped for each key: one action for key press and another for key press-and-hold. You can map different actions for Flip closed and Flip opened modes.
The following keys can be mapped:
Internet key
Camera key
Power key
Jog Dial away (backward)
Jog Dial towards (forward)
You can also set some action to opening flip event, for example, start your favorite application.
Tip: You can get a quick one-hand access to your favorites using Key Mapper + Handy Desktop.
You can map one of the P900 keys with Key Mapper to start Handy Desktop and then run your favorite applications, files, URLs, contacts, calls, and SMSs from Handy Desktop shortcuts. So, you can control your P900 (for example, make a call) with one hand, and no stylus is needed.
More at: http://www.epocware.com/SE_P900/Key_Mapper.html