The name changes are shown as a link on the person's profile. I wouldn't want to allow lots of changes so that we avoid tons of name changes all the time. Who knows, maybe we will allow one name change in a year or one change in a month or none at all without help from staff. Not sure yet but it is an available option which makes it good in my book.
Being able to change your username?
How would that work exactly? And how would we know who the person is afterward?
Another thing - is there any way to turn off the new photos in posts feature once it is added? I have dial up and if there's a ton of pictures on the page the site will take forever to load.
The posted images... Great news for you! There is actually a setting that you can use to turn off all images posted in the forums. This would keep things loading fast for you. As an alternatve you would also be able to use the mobile skin which is made specifically for slower internet connections like mobile devices and dial-up connections.