Does theme have page or post revision control feature

Is there a feature in ATO to turn off or limit page and post revisions? If so, where. If not, short of a plugin, do you recommend adding code to the top of the wp-config.php file like this (found this code after an extensive search):

//Turn OFF WP revisions feature.
define ('WP_POST_Revisions', false);
define ('WP_PAGE_Revisions', false);

or to limit reivisions

//Limit WP revisions. Value can be any positive integer number.
//Create a maximum of 2 revisions, plus one for auto-save.
define ('WP_POST_REVISIONS', 2);
define ('WP_PAGE_REVISIONS', 2);

Thanks in advance for your help.