Maybe some ugly solution about sysfs entry, where few affected ones could write vendor PIDs? I mean, that mice path would be enabled for HID by default, and also for devices matching ID's from sysfs entry/config file...

Ugly, but should work and - as far as my miserably limited developing knowledge goes - it shouldn't be too troublesome to actually code.

/Estel

// Edit

Or even more simple solution - sysfs entry to turn on and off mice patch (still, used by default for HID). I doubt that anyone is using conflicting and non-conflicting headset at the same time (literally, both connected at the same time)?