There's a reason, though, why that feature is not found in Remote Buddy.

The Wiili.org wiki already says it well, so I'll just quote it here.

-- Quote: http://www.wiili.org/Wiimote#IR_Sensor --

[..]

During R&D, Nintendo discovered the motion sensors were not accurate 
enough to use the remote to control an on-screen cursor. To correct 
this, they augmented the remote with an infrared image sensor on the 
front designed to locate two IR beacons within the controller's field 
of view. The beacons are housed within a device misleadingly called 
the Sensor Bar.

These two sources of IR light are tracked by a PixArt sensor in the 
front of the Wiimote housing. By tracking the locations of these two 
points in the sensors 2D field of view, the system can derive more 
accurate pointing information.

[..]

-- End of quote --

My own tests showed me that the accellerometers are not a good data 
source for implementing a virtual mouse - at least if you really want 
to use it beyond a technical demo. I was regularly faster at 
positioning the mouse cursor using just the remote's buttons and 
Remote Buddy's "normal" virtual mouse.

Best regards, 
Felix Schwarz