Uummh... Sorry but what you are saying makes absolutely no sense.
Pretty sure that maybe about 75% of users never need to change their username. So everyone could do what you said.
Even if all of them would change it. Every user is able to see the first/main username of someone in their name history popup page, from their profile.
I can see that you never changed yours, and that Jessica changed it once from jesirose. (I'm gonna hack ya both ! )
Its a joke if they would really go for this "security" option. Usernames are avaivable to the public on all sites.
What if the user, as a dumb child, registers the forum with a damn stupid name..
For example; BigCo*k69. As days-years pass and he realises how dumb it is to use such a name.....
Do you think he would still want to write this everytime he logs in, after he changed his username as a reminder on how dumb he was??
Or what if he just misspelled his user. When you registered, you could have accidentally wrote "Philiop".
Would you want to login with that forever just because of a silly spelling mistake.....?
I see no point in changing your username and still keeping the first username as a login method.
PS: How many platforms that function this way are there?
Not bashing on IP Board. It looks good. The only thing i dont like about it is this issue and that when you right click in the writing area, it displays the menu it shows on a background area, instead of the text menu with cut/copy/paste/etc..