Hi.
While I already have made a feature request via the support ticket system, I choose to post it here in order for other to see and voice their thoughts/support etc..
This is a feature request. I would like to see
dns-01 challenge claims supported in the Let's Encrypt app
Duck DNS supported as an option in the dynamic DNS configuration.
Reasoning: Supporting DNS-01 challenge for domain validation removes the need to expose port 80/443 for certificate creation and renewal. As Duck DNS exposes a TXT record related API, adding Duck DNS is natural choice.