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To edit your DNS record manually (not through WHM), login as root using your favorite terminal client and edit the /var/named/username.db file. Substitute your actual cpanel username for 'username'.
Even though I only have a shared hosting plan, their technical support team responded to my tech support request within the hour, and correctly to boot. (I needed to have a subdomain point to a Tumblr blog by changing the CNAME.)
I had never heard of AYK Solutions before, but they had an awesome deal I couldn't pass up on WHT. So far the service has been exceptional, and the server is rock solid. I'll be moving my other servers here soon!