This message was posted on behalf of Intel Corporation
Unfortunately, changing the transmission power level is still not implemented in the current image (as you can see in the thread you mention above).
The BCM43340 (by itself) can operate at Bluetooth Class 1 or Class 2 transmitter operation. If you would like the Bluetooth class current on your Edison, you can run the command:
hciconfig hci0 class
I hope this helps.