The devices get a key lock issue, and result in repeeeeeeeeeeeated keystrokes, or just no keystrokes depending on when the Bluetooth stream from the device freezes.
For the record, I am not a ROM developer. I do know you can make a flashable zip fairly easily, as described in a few threads here on XDA.
I'm trying to work out whether it would be possible to create a flashable ZIP of just the bluetooth components from Android 4.4.2 and flash those over a 4.4.3 or 4.4.4 ROM.
My thinking is that flashing the previously working bluetooth components would fix the issue, and restore stabilty to the OS.
I'd be very interested for opinions from ROM devs whether this approach could work, or whether loading a previous versions' bluetooth stack would cause more instability.