So, I have...
Side Top Button: Bluetoof on/off
Side Mid Button: Bluetoof Inquiry
If you read the help files, you'll discover that both of these functions have a press and a long press command associated with them. I believe you will need BT Inquiry around long enough to pair your device(s). Once completed, you can remove BT Inquiry and replace it with a more useful function.
As I said, you kind of have to fiddle with it, but it works.