cPanel has already support for Mail SNI.
It would be great if this could be extended to FTP as well as all other cpanel related subdomains, i.e.
and all other service related subdomains that can be managed by cPanel (webdav etc).
Call for Comments
Currently, when a cPanel user acquires a SSL certificate, they can only install it for Apache. There is currently no way for a cPanel user to use their own certificate for other SSL-powered services like IMAP over SSL, webdisk etc.
The proposal is to allow cPanel users to install SSL certificates for their own domains for all services, including cpdavd (webdisk), cpsrvd (webmail, cPanel and WHM), IMAP, POP, SMTP etc. One can install a wildcard certificate to cover all services or install individual certificates for each service.