I would like to see official support from Cloudflare through the release of a server administrator configurable Auto SSL provider. As of now there are two available for server admins; cPanel w/Comodo, or LetsEncrypt. I think it would be awesome to have Cloudflare offer this as an official “AutoSSL” provider, even for domains not using Cloudflare for HTTP proxying.
https://documentation.cpanel.net/display/DD/Guide+to+Third-Party+AutoSSL+Provider+Modules