Could you provide some more information or an example of what service you would like to require SSL for? For instance, is this for the cPanel/WHM service, or for Apache when your websites are accessed?
Issue is that CP login should be more protected. If there is old login it will not be tracked which IP is logged in cPanel/WHM service. Reseller accounts have issue due to fact that SSL can not be implemented with digital signature (personal card). Login into CP can be prevented with default SSL when logged in cPanel/WHM service.
You can require SSL for all remote logins to cPanel, WHM, and Webmail by enabling the following option under the "Security" tab in "WHM Home » Server Configuration » Tweak Settings":