Interface for customising Open ID Connect Login buttons
The External Authentication buttons on the cPanel login page (eg. "Login via WHMCS") can currently be modified by duplicating and editing files as discussed at https://forums.cpanel.net/threads/external-authentication-customization.523281/
However this may prove to difficult for some users, so an interface within WHM whereby the button colour, image and text could be customised, would be more accessible and user-friendly.
For example; many WHMCS users do not refer to the software by its brand name, but rather a generic term such as "Client Area", Members Area" etc. Therefore the ability to easily change the login button would be beneficial.