Custom Domain changes Domain and multiple custom domains

Hello,

I am testing out Domain Mapping on a new site. I downloaded the latest version,3.1.6, and it appears to work differently than the previous one that I was using, 3.0.7.

Issue 1: When I enter a Custom Domain and then visit the site via the Original Blog Address the domain switches to the Custom Domain. This is not what I expected or want. When I enter a Custom Domain I want to original to be shown to the site visitor.
Issue 2: In the previous version I could enter multiple Custom Domain's, now I can only enter 1. I have several domain names that I want to point to one Orginal Blog Address.

TYIA,

Happy New Year!

~eric