A user may want to use a different autodiscover address but there is no way for the user or server admin to change this in cPanel or WHM. You can use the included editor to add a custom redirect for your specific domain. WHM > Service Configuration > Include Editor.
In this example the domain domain.com wants autodiscover to load autodiscover.domain.com
Example rewrite rule to be placed into /usr/local/apache/conf/includes/pre_main_2.conf