For the Advanced Dynadot DNS name server setting, we have added the option to select a CNAME record instead of an A record for just the domain name (http://mydomain.com). This would be useful for those who have blogs and want them to be on a custom domain.
Also, we've combined the A and CNAME record sections for subdomains. This allows you to have a combination of up to 20 CNAME and A subdomain records instead of 10 each.
We have added email aliases (including catch-all) to our Advanced Dynadot DNS name server setting. You can set up your email aliases for your DNS in the "Email Forwarding Settings" box.
Please let us know if you have any further questions about this.