usbhidaction with non-HID devices

[Warren Block]

My Epson scanner has one button.  I'd like to have that button activate 
a program.  usbhidaction(1) does that for uhid devices.

Of course, the scanner is not a HID, and usbhidaction doesn't like 
non-HID devices:

   % usbhidaction -v -c usbhid.conf -f uscanner0
   usbhidaction: hid_get_report_desc() failed: Operation not supported by device

Is there an existing way to do this?

If not, is it possible to modify usbhidaction or uscanner to support it?

-Warren Block * Rapid City, South Dakota USA