The mod_md work to support TLS-SNI challenges is no longer useful with Let's Encrypt as that method has been deprecated due to security issues. The replacement is Acme's TLS-ALPN challenge as described in https://tools.ietf.org/html/draft-ietf-acme-tls-alpn-05 It would be very helpful for Apache HTTPD to support this new challenge type.
Totally agree. Note however that his necessitates the support for ACMEv2 where current mod_md only runs against a ACMEv1 endpoint.
A very early experience version can be found at the github repository: https://github.com/icing/mod_md Always looking for testers and feedback.