Using the Root Domain on a Multi-Domains Install

So, here's the setup:

WordPress MultiSite is installed on
Multi-Domains is installed.,, and are, as the names imply, added to via the Multi-Domains plugin.

Is it then possible to have different sites up on the root of,, and If an attempt is made to map a domain to (via Domain Mapping), a "domain exists" error will be encountered. At present, the domains added via Multi-Domains all redirect to

Short version: Is it possible to have different root sites for each domain in a Multi-Domains setup?