- Radio Tuner (assuming the correct hardware is installed)
- XM Radio (Addon?) (functionality?) if correct hardware is installed
- Bluetooth functions from within xbmc, for phone connections and media streaming from the phone to the carPC
I know the number of people who would use this is incredibly narrow, so I wouldn't expect it to be a priority if these things don't already exist, but I think it would be really cool to have those available features.
I also know these things could probably be mostly done by an addon, the problem with add-ons in my opinion is their jankyness and the inability to be seamless and fully integrate into xbmc.
I imagine you could have a wonky setup and technically have all of the features, but a fully polished impressive carPC thing would be really cool, for the 50 people who would use it
I Has Ideas, thanks for letting me share them