Not saying this isn't a valid request, but it has been made in the past. However, it is easy to script around (still, doesn't mean the request can't be made), if use /server when you start up: /help /server

Code:
on *:START:{
  server irc.host1.com 6667 -i Dietmar Dietmar_ email@domain.dom Full Name
  server -m irc.host2.net 6669 -i Nickname Alternate otheremail@2nd.domain.net Fake Name
}

Then say Use ID from Email address in Options -> Connect -> Identd