Anope does not support non-standard vHosts and will not. The reason being is not all IRCd's support non-standard vHosts, so by sticking to the basic support, Anope avoids errors caused when a user tries to use a non-standard vHost on an IRCd that does not support a non-standard vHost.
End result: Anope will not support non-standard vHosts, and does not support them on IRCd's that do either. Modifying Anope to support them will most likely break things and even if it doesn't you will lose support.