[PROBLEM] BT pairing = Frozen RPi-ZeroW UI

[S_i_O]

I can see a case in crowded Europe where Bluetooth can be connected to by the chap in the next apartment if the pairing agent is on.

I have just tried to pair on my Pi Zero W with the agent turned off, and I see the same thing.  I get an "accept and pair" message on the connecting device when I press pair in moOde, but it vanishes before I can accept, then the moOde interface becomes unresponsive and I have to reboot.

To repro:

1. REMOVE all devices command in Bluetooth control
   
2. Set Pairing agent to OFF in Renderers.
   
3. SCAN (Standard) in Bluetooth control
   
4. PAIR in Bluetooth control
   
5. Instant death.
   

That pretty much sums it up.
My townhouse wall does let bluetooth bleed into my neighbors house...   

Would a manually added "Bluetooth MAC" Whitelist be a feasible workaround?