Nej, jag har inte provat det.
Dock har Garmin idag släppt POI Loader 2.4.0.0 Beta med många nya finesser inom det område Du efterfrågar.
Jag har precis installerat, men inte testat nåt speciellt än.
Changes made from version 2.3.2 to 2.4.0:
Added support for Windows Mobile devices.
Added support for uninstalling all custom POI's from a device.
Added support for subcategories of POI's.
Added support for handling individual bitmap symbols for each subcategory of POI's.
Added support for jpeg (.jpg) images that can be associated with POI's.
Added support for wave (.wav) files POI alerts.
Added support for allowing users to specify a 'Link' directory that contain POI associations, such as bitmap (.bmp) symbols, jpeg (.jpg) images, mp3 (.mp3) audio files, or wave (.wav) audio files.
Added support for contact information and address information that can be specified in a GPX (.gpx) file.
Added a command line option to POI Loader to run automatically without requiring user interaction.
Added the ability to choose POI files to ignore.
Check for validity of the drive name in the POI path.