Comment 5 for bug 628087

For the typical home use situation, having the user name as the host name doesn't really seem like much of a security risk, in a corporate situation I would be more inclined to think about the security implications.

Duplicate hostnames on the network seems like a much bigger issue.

The best solution to me would be to have a single page where as you type in your desired user name in the username box, also have an editable hostname box that has a random segment that gets generated when the page comes up and a username segment that is filled as the user types their desired username so you end up with a 'username-XXXXXXXX' type hostname by default.

If the user doesn't care about or is happy with the default hostname they could then just hit next, if they want to change it they click on or tab to the hostname box, put in their desired hostname and hit next. No muss, no fuss.