I originally posted this in the support forum, but since I didn't get any answer within two months, I'm posting it here.
I'd really love to use CNAME on root of my domains. It seems that CNAME on root records are perfectly doable.
See this article: http://pzxc.com/cname-on-domain-root-does-work
Sorry for my confusing english, I'm speaking only portuguese for a long time now.
Thanks and best regards!