I finally found this post that appears to remove the bluetooth disconnect notice from the notifications on the Imagio:
The Registry tweak to disable Bluetooth warnings on disconnected headset is to set 536870912 in "HKCU" -> "\ControlPanel\Notifications\{607CDEA2-E44A-4528-A2C3-A7DC6B6D824D}" -> "Options".
kwbr HD version 5.2 :: 21914 :: 23144 - Page 651 - xda-developers