Hi Greg,
Let me answer all the questions,
There is no license key required to use DFS band, they will be available for free, you would need to upgrade to latest firmware once we receive approval. We are currently pending by IC regulatory body approval, we expect to be granted in early Q4 2018.
In regards to Tx Power configuration, it is bound by regualtory, APTC etc, we have detailed community post here:
NOTE: PTP 550 is currently not added to table, it will added soon
Thanks
Sagar