Caches are static files. served directly by the server, You have no need to track static files resource usage other than disk space. Managing disk space is not webserver's function. you can write your own script with cron to check if you really want to
It should not have any impact to apache since the directives are enclosed by <IfModule LiteSpeed>...</IfModule>. If you follow the wiki to add it to cpanel global include file or individual include file, it should be fine.