Ideas portal custom subdomain Merged

I want to be able to set up a custom subdomain for my Aha! ideas portal. For example: ideas.mydomain.com. Not having this feature is preventing me from easily replacing our old ideas software with Aha (UserVoice supports this functionality).

Using the iframe option has proven difficult when all I really want is to use the subdomain I've used before (so that changes to inbound links are minimal).