How to create a CNAME for a domain's root name

I'd like to set a domain's root name to a CNAME instead of the usual A record.

Here's a perfect example of what I'm trying to do:

dig lrnskls.com

Notice the answer section:

;; ANSWER SECTION:

lrnskls.com.            300     IN      CNAME   partner.adjix.com.

partner.adjix.com.      300     IN      A       67.121.212.61

The reason I'm trying to do this is so I can point a domain's root name, via a CNAME alias, to Amazon's S3. Using an A record doesn't work because S3's IPs change every few minutes for load balancing purposes.

PS - This seems to be legal under section 3.6.2 of RFC 1034 (note the USC-ISIC.ARPA example):
http://www.faqs.org/rfcs/rfc1034.html